/*---------------------------------------------------------------------------*/
/*  FatFs - FAT file system module include R0.11a    (C)ChaN, 2015           */
/*----------------------------------------------------------------------------*/
/* FatFs module is a free software that opened under license policy of
 * following conditions.
 *
 * Copyright (C) 2015, ChaN, all right reserved.
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this condition and the following disclaimer.
 *
 * This software is provided by the copyright holder and contributors "AS IS"
 * and any warranties related to this software are DISCLAIMED.
 * The copyright owner or contributors be NOT LIABLE for any damages caused
 * by use of this software.
 *
 * Copyright (c) 2015, University of Cambridge.
 * All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University of Cambridge nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * IN NO EVENT SHALL UNIVERSITY OF CAMBRIDGE BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS
 * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * UNIVERSITY OF CAMBRIDGE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY,
 * PROVIDED HEREUNDER IS PROVIDED "AS IS". UNIVERSITY OF CAMBRIDGE HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
 * MODIFICATIONS.
 */
/*---------------------------------------------------------------------------*/

#include "ff.h"         /* Declarations of FatFs API */
#include "diskio.h"     /* Declarations of disk I/O functions */


/*--------------------------------------------------------------------------

  Module Private Definitions

  ---------------------------------------------------------------------------*/

#if _FATFS != 64180 /* Revision ID */
#error Wrong include file (ff.h).
#endif


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define ENTER_FF(fs)        { if (!lock_fs(fs)) return FR_TIMEOUT; }
#define LEAVE_FF(fs, res)   { unlock_fs(fs, res); return res; }
#else
#define ENTER_FF(fs)
#define LEAVE_FF(fs, res)   return res
#endif

#define ABORT(fs, res)      { fp->err = (uint8_t)(res); LEAVE_FF(fs, res); }


/* Definitions of sector size */
#if (_MAX_SS < _MIN_SS) || (_MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096) || (_MIN_SS != 512 && _MIN_SS != 1024 && _MIN_SS != 2048 && _MIN_SS != 4096)
#error Wrong sector size configuration
#endif
#if _MAX_SS == _MIN_SS
#define SS(fs)  ((uint32_t)_MAX_SS) /* Fixed sector size */
#else
#define SS(fs)  ((fs)->ssize)   /* Variable sector size */
#endif


/* Timestamp feature */
#if _FS_NORTC == 1
#if _NORTC_YEAR < 1980 || _NORTC_YEAR > 2107 || _NORTC_MON < 1 || _NORTC_MON > 12 || _NORTC_MDAY < 1 || _NORTC_MDAY > 31
#error Invalid _FS_NORTC settings
#endif
#define GET_FATTIME()   ((uint32_t)(_NORTC_YEAR - 1980) << 25 | (uint32_t)_NORTC_MON << 21 | (uint32_t)_NORTC_MDAY << 16)
#else
#define GET_FATTIME()   get_fattime()
#endif


/* File access control feature */
#if _FS_LOCK
#if _FS_READONLY
#error _FS_LOCK must be 0 at read-only configuration
#endif
typedef struct {
  FATFS *fs;        /* Object ID 1, volume (NULL:blank entry) */
  uint32_t clu;     /* Object ID 2, directory (0:root) */
  uint16_t idx;     /* Object ID 3, directory index */
  uint16_t ctr;     /* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
} FILESEM;
#endif



/* DBCS code ranges and SBCS upper conversion tables */

#if _CODE_PAGE == 932   /* Japanese Shift-JIS */
#define _DF1S   0x81    /* DBC 1st byte range 1 start */
#define _DF1E   0x9F    /* DBC 1st byte range 1 end */
#define _DF2S   0xE0    /* DBC 1st byte range 2 start */
#define _DF2E   0xFC    /* DBC 1st byte range 2 end */
#define _DS1S   0x40    /* DBC 2nd byte range 1 start */
#define _DS1E   0x7E    /* DBC 2nd byte range 1 end */
#define _DS2S   0x80    /* DBC 2nd byte range 2 start */
#define _DS2E   0xFC    /* DBC 2nd byte range 2 end */

#elif _CODE_PAGE == 936 /* Simplified Chinese GBK */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0x80
#define _DS2E   0xFE

#elif _CODE_PAGE == 949 /* Korean */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x41
#define _DS1E   0x5A
#define _DS2S   0x61
#define _DS2E   0x7A
#define _DS3S   0x81
#define _DS3E   0xFE

#elif _CODE_PAGE == 950 /* Traditional Chinese Big5 */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0xA1
#define _DS2E   0xFE

#elif _CODE_PAGE == 437 /* U.S. */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
      0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 720 /* Arabic */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 737 /* Greek */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
      0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xEF,0xF5,0xF0,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 771 /* KBL */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDC,0xDE,0xDE, \
      0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 775 /* Baltic */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F, \
      0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
      0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 850 /* Latin 1 */
#define _DF1S   0
#define _EXCVT {0x43,0x55,0x45,0x41,0x41,0x41,0x41,0x43,0x45,0x45,0x45,0x49,0x49,0x49,0x41,0x41, \
      0x45,0x92,0x92,0x4F,0x4F,0x4F,0x55,0x55,0x59,0x4F,0x55,0x4F,0x9C,0x4F,0x9E,0x9F, \
      0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0x41,0x41,0x41,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0x41,0x41,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD1,0xD1,0x45,0x45,0x45,0x49,0x49,0x49,0x49,0xD9,0xDA,0xDB,0xDC,0xDD,0x49,0xDF, \
      0x4F,0xE1,0x4F,0x4F,0x4F,0x4F,0xE6,0xE8,0xE8,0x55,0x55,0x55,0x59,0x59,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852 /* Latin 2 */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F, \
      0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0xAC, \
      0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 855 /* Cyrillic */
#define _DF1S   0
#define _EXCVT {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F, \
      0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
      0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
      0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF, \
      0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 857 /* Turkish */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x49,0x8E,0x8F, \
      0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
      0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0x49,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 860 /* Portuguese */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x8F,0x8E,0x91,0x86,0x80,0x89,0x89,0x92,0x8B,0x8C,0x98,0x8E,0x8F, \
      0x90,0x91,0x92,0x8C,0x99,0xA9,0x96,0x9D,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x86,0x8B,0x9F,0x96,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 861 /* Icelandic */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x8B,0x8B,0x8D,0x8E,0x8F, \
      0x90,0x92,0x92,0x4F,0x99,0x8D,0x55,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
      0xA4,0xA5,0xA6,0xA7,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 862 /* Hebrew */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 863 /* Canadian-French */
#define _DF1S   0
#define _EXCVT {0x43,0x55,0x45,0x41,0x41,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x41,0x8F, \
      0x45,0x45,0x45,0x4F,0x45,0x49,0x55,0x55,0x98,0x4F,0x55,0x9B,0x9C,0x55,0x55,0x9F, \
      0xA0,0xA1,0x4F,0x55,0xA4,0xA5,0xA6,0xA7,0x49,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 864 /* Arabic */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
      0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 865 /* Nordic */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
      0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
      0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 866 /* Russian */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
      0x90,0x91,0x92,0x93,0x9d,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
      0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 869 /* Greek 2 */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
      0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x86,0x9C,0x8D,0x8F,0x90, \
      0x91,0x90,0x92,0x95,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
      0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
      0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF, \
      0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xA4,0xA5,0xA6,0xD9,0xDA,0xDB,0xDC,0xA7,0xA8,0xDF, \
      0xA9,0xAA,0xAC,0xAD,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xCF,0xCF,0xD0,0xEF, \
      0xF0,0xF1,0xD1,0xD2,0xD3,0xF5,0xD4,0xF7,0xF8,0xF9,0xD5,0x96,0x95,0x98,0xFE,0xFF}

#elif _CODE_PAGE == 1   /* ASCII (for only non-LFN cfg) */
#if _USE_LFN
#error Cannot use LFN feature without valid code page.
#endif
#define _DF1S   0

#else
#error Unknown code page

#endif


  /* Character code support macros */
#define IsUpper(c)  (((c)>='A')&&((c)<='Z'))
#define IsLower(c)  (((c)>='a')&&((c)<='z'))
#define IsDigit(c)  (((c)>='0')&&((c)<='9'))

#if _DF1S       /* Code page is DBCS */

#ifdef _DF2S    /* Two 1st byte areas */
#define IsDBCS1(c)  (((uint8_t)(c) >= _DF1S && (uint8_t)(c) <= _DF1E) || ((uint8_t)(c) >= _DF2S && (uint8_t)(c) <= _DF2E))
#else           /* One 1st byte area */
#define IsDBCS1(c)  ((uint8_t)(c) >= _DF1S && (uint8_t)(c) <= _DF1E)
#endif

#ifdef _DS3S    /* Three 2nd byte areas */
#define IsDBCS2(c)  (((uint8_t)(c) >= _DS1S && (uint8_t)(c) <= _DS1E) || ((uint8_t)(c) >= _DS2S && (uint8_t)(c) <= _DS2E) || ((uint8_t)(c) >= _DS3S && (uint8_t)(c) <= _DS3E))
#else           /* Two 2nd byte areas */
#define IsDBCS2(c)  (((uint8_t)(c) >= _DS1S && (uint8_t)(c) <= _DS1E) || ((uint8_t)(c) >= _DS2S && (uint8_t)(c) <= _DS2E))
#endif

#else           /* Code page is SBCS */

#define IsDBCS1(c)  0
#define IsDBCS2(c)  0

#endif /* _DF1S */


  /* Name status flags */
#define NSFLAG      11      /* Index of name status byte in fn[] */
#define NS_LOSS     0x01    /* Out of 8.3 format */
#define NS_LFN      0x02    /* Force to create LFN entry */
#define NS_LAST     0x04    /* Last segment */
#define NS_BODY     0x08    /* Lower case flag (body) */
#define NS_EXT      0x10    /* Lower case flag (ext) */
#define NS_DOT      0x20    /* Dot entry */


  /* FAT sub-type boundaries (Differ from specs but correct for real DOS/Windows) */
#define MIN_FAT16   4086U   /* Minimum number of clusters of FAT16 */
#define MIN_FAT32   65526U  /* Minimum number of clusters of FAT32 */


  /* FatFs refers the members in the FAT structures as byte array instead of
     / structure members because the structure is not binary compatible between
     / different platforms */

#define BS_jmpBoot          0       /* x86 jump instruction (3) */
#define BS_OEMName          3       /* OEM name (8) */
#define BPB_BytsPerSec      11      /* Sector size [byte] (2) */
#define BPB_SecPerClus      13      /* Cluster size [sector] (1) */
#define BPB_RsvdSecCnt      14      /* Size of reserved area [sector] (2) */
#define BPB_NumFATs         16      /* Number of FAT copies (1) */
#define BPB_RootEntCnt      17      /* Number of root directory entries for FAT12/16 (2) */
#define BPB_TotSec16        19      /* Volume size [sector] (2) */
#define BPB_Media           21      /* Media descriptor (1) */
#define BPB_FATSz16         22      /* FAT size [sector] (2) */
#define BPB_SecPerTrk       24      /* Track size [sector] (2) */
#define BPB_NumHeads        26      /* Number of heads (2) */
#define BPB_HiddSec         28      /* Number of special hidden sectors (4) */
#define BPB_TotSec32        32      /* Volume size [sector] (4) */
#define BS_DrvNum           36      /* Physical drive number (1) */
#define BS_NTres            37      /* Error flag (1) */
#define BS_BootSig          38      /* Extended boot signature (1) */
#define BS_VolID            39      /* Volume serial number (4) */
#define BS_VolLab           43      /* Volume label (8) */
#define BS_FilSysType       54      /* File system type (1) */
#define BPB_FATSz32         36      /* FAT size [sector] (4) */
#define BPB_ExtFlags        40      /* Extended flags (2) */
#define BPB_FSVer           42      /* File system version (2) */
#define BPB_RootClus        44      /* Root directory first cluster (4) */
#define BPB_FSInfo          48      /* Offset of FSINFO sector (2) */
#define BPB_BkBootSec       50      /* Offset of backup boot sector (2) */
#define BS_DrvNum32         64      /* Physical drive number (1) */
#define BS_NTres32          65      /* Error flag (1) */
#define BS_BootSig32        66      /* Extended boot signature (1) */
#define BS_VolID32          67      /* Volume serial number (4) */
#define BS_VolLab32         71      /* Volume label (8) */
#define BS_FilSysType32     82      /* File system type (1) */
#define FSI_LeadSig         0       /* FSI: Leading signature (4) */
#define FSI_StrucSig        484     /* FSI: Structure signature (4) */
#define FSI_Free_Count      488     /* FSI: Number of free clusters (4) */
#define FSI_Nxt_Free        492     /* FSI: Last allocated cluster (4) */
#define MBR_Table           446     /* MBR: Partition table offset (2) */
#define SZ_PTE              16      /* MBR: Size of a partition table entry */
#define BS_55AA             510     /* Signature word (2) */

#define DIR_Name            0       /* Short file name (11) */
#define DIR_Attr            11      /* Attribute (1) */
#define DIR_NTres           12      /* Lower case flag (1) */
#define DIR_CrtTimeTenth    13      /* Created time sub-second (1) */
#define DIR_CrtTime         14      /* Created time (2) */
#define DIR_CrtDate         16      /* Created date (2) */
#define DIR_LstAccDate      18      /* Last accessed date (2) */
#define DIR_FstClusHI       20      /* Higher 16-bit of first cluster (2) */
#define DIR_WrtTime         22      /* Modified time (2) */
#define DIR_WrtDate         24      /* Modified date (2) */
#define DIR_FstClusLO       26      /* Lower 16-bit of first cluster (2) */
#define DIR_FileSize        28      /* File size (4) */
#define LDIR_Ord            0       /* LFN entry order and LLE flag (1) */
#define LDIR_Attr           11      /* LFN attribute (1) */
#define LDIR_Type           12      /* LFN type (1) */
#define LDIR_Chksum         13      /* Checksum of corresponding SFN entry */
#define LDIR_FstClusLO      26      /* Must be zero (0) */
#define SZ_DIRE             32      /* Size of a directory entry */
#define LLEF                0x40    /* Last long entry flag in LDIR_Ord */
#define DDEM                0xE5    /* Deleted directory entry mark at DIR_Name[0] */
#define RDDEM               0x05    /* Replacement of the character collides with DDEM */




/*--------------------------------------------------------------------------

  Module Private Work Area

  ---------------------------------------------------------------------------*/

/* Remark: Uninitialized variables with static duration are guaranteed
 *  zero/null at start-up. If not, either the linker or start-up routine
 *  being used is not compliance with ANSI-C standard.
 */

#if _VOLUMES < 1 || _VOLUMES > 9
#error Wrong _VOLUMES setting
#endif
static FATFS *FatFs[_VOLUMES];  /* Pointer to the file system objects (logical drives) */
static uint16_t Fsid;               /* File system mount ID */

#if _FS_RPATH && _VOLUMES >= 2
static uint8_t CurrVol;            /* Current drive */
#endif

#if _FS_LOCK
static FILESEM Files[_FS_LOCK]; /* Open object lock semaphores */
#endif

#if _USE_LFN == 0           /* Non LFN feature */
#define DEFINE_NAMEBUF      uint8_t sfn[12]
#define INIT_BUF(dobj)      (dobj).fn = sfn
#define FREE_BUF()
#else
#if _MAX_LFN < 12 || _MAX_LFN > 255
#error Wrong _MAX_LFN setting
#endif
#if _USE_LFN == 1           /* LFN feature with static working buffer */
static uint16_t LfnBuf[_MAX_LFN + 1];
#define DEFINE_NAMEBUF      uint8_t sfn[12]
#define INIT_BUF(dobj)      { (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
#define FREE_BUF()
#elif _USE_LFN == 2         /* LFN feature with dynamic working buffer on the stack */
#define DEFINE_NAMEBUF      uint8_t sfn[12]; uint16_t lbuf[_MAX_LFN + 1]
#define INIT_BUF(dobj)      { (dobj).fn = sfn; (dobj).lfn = lbuf; }
#define FREE_BUF()
#elif _USE_LFN == 3         /* LFN feature with dynamic working buffer on the heap */
#define DEFINE_NAMEBUF      uint8_t sfn[12]; uint16_t *lfn
#define INIT_BUF(dobj)      { lfn = ff_memalloc((_MAX_LFN + 1) * 2); if (!lfn) LEAVE_FF((dobj).fs, FR_NOT_ENOUGH_CORE); (dobj).lfn = lfn; (dobj).fn = sfn; }
#define FREE_BUF()          ff_memfree(lfn)
#else
#error Wrong _USE_LFN setting
#endif
#endif

#ifdef _EXCVT
static const uint8_t ExCvt[] = _EXCVT; /* Upper conversion table for SBCS extended characters */
#endif






/*--------------------------------------------------------------------------

  Module Private Functions

  ---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static
void mem_cpy (void* dst, const void* src, uint32_t cnt) {
  uint8_t *d = (uint8_t*)dst;
  const uint8_t *s = (const uint8_t*)src;

#if _WORD_ACCESS == 1
  while (cnt >= sizeof (int)) {
    *(int*)d = *(int*)s;
    d += sizeof (int); s += sizeof (int);
    cnt -= sizeof (int);
  }
#endif
  while (cnt--)
    *d++ = *s++;
}

/* Fill memory */
static
void mem_set (void* dst, int val, uint32_t cnt) {
  uint8_t *d = (uint8_t*)dst;

  while (cnt--)
    *d++ = (uint8_t)val;
}

/* Compare memory to memory */
static
int mem_cmp (const void* dst, const void* src, uint32_t cnt) {
  const uint8_t *d = (const uint8_t *)dst, *s = (const uint8_t *)src;
  int r = 0;

  while (cnt-- && (r = *d++ - *s++) == 0) ;
  return r;
}

/* Check if chr is contained in the string */
static
int chk_chr (const char* str, int chr) {
  while (*str && *str != chr) str++;
  return *str;
}




/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
#if _FS_REENTRANT
static
int lock_fs (
             FATFS* fs      /* File system object */
             )
{
  return ff_req_grant(fs->sobj);
}


static
void unlock_fs (
                FATFS* fs,      /* File system object */
                FRESULT res     /* Result code to be returned */
                )
{
  if (fs &&
      res != FR_NOT_ENABLED &&
      res != FR_INVALID_DRIVE &&
      res != FR_INVALID_OBJECT &&
      res != FR_TIMEOUT) {
    ff_rel_grant(fs->sobj);
  }
}
#endif




/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/
#if _FS_LOCK

static
FRESULT chk_lock (  /* Check if the file can be accessed */
                  DIR* dp,      /* Directory object pointing the file to be checked */
                  int acc       /* Desired access type (0:Read, 1:Write, 2:Delete/Rename) */
                    )
{
  uint32_t i, be;

  /* Search file semaphore table */
  for (i = be = 0; i < _FS_LOCK; i++) {
    if (Files[i].fs) {  /* Existing entry */
      if (Files[i].fs == dp->fs &&      /* Check if the object matched with an open object */
          Files[i].clu == dp->sclust &&
          Files[i].idx == dp->index) break;
    } else {            /* Blank entry */
      be = 1;
    }
  }
  if (i == _FS_LOCK)    /* The object is not opened */
    return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;   /* Is there a blank entry for new object? */

  /* The object has been opened. Reject any open against writing file and all write mode open */
  return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static
int enq_lock (void) /* Check if an entry is available for a new object */
{
  uint32_t i;

  for (i = 0; i < _FS_LOCK && Files[i].fs; i++) ;
  return (i == _FS_LOCK) ? 0 : 1;
}


static
uint32_t inc_lock ( /* Increment object open counter and returns its index (0:Internal error) */
                   DIR* dp,     /* Directory object pointing the file to register or increment */
                   int acc      /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
                    )
{
  uint32_t i;


  for (i = 0; i < _FS_LOCK; i++) {  /* Find the object */
    if (Files[i].fs == dp->fs &&
        Files[i].clu == dp->sclust &&
        Files[i].idx == dp->index) break;
  }

  if (i == _FS_LOCK) {              /* Not opened. Register it as new. */
    for (i = 0; i < _FS_LOCK && Files[i].fs; i++) ;
    if (i == _FS_LOCK) return 0;    /* No free entry to register (int err) */
    Files[i].fs = dp->fs;
    Files[i].clu = dp->sclust;
    Files[i].idx = dp->index;
    Files[i].ctr = 0;
  }

  if (acc && Files[i].ctr) return 0;    /* Access violation (int err) */

  Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;    /* Set semaphore value */

  return i + 1;
}


static
FRESULT dec_lock (  /* Decrement object open counter */
                  uint32_t i            /* Semaphore index (1..) */
                    )
{
  uint16_t n;
  FRESULT res;


  if (--i < _FS_LOCK) { /* Shift index number origin from 0 */
    n = Files[i].ctr;
    if (n == 0x100) n = 0;      /* If write mode open, delete the entry */
    if (n) n--;                 /* Decrement read mode open count */
    Files[i].ctr = n;
    if (!n) Files[i].fs = 0;    /* Delete the entry if open count gets zero */
    res = FR_OK;
  } else {
    res = FR_INT_ERR;           /* Invalid index nunber */
  }
  return res;
}


static
void clear_lock (   /* Clear lock entries of the volume */
                 FATFS *fs
                    )
{
  uint32_t i;

  for (i = 0; i < _FS_LOCK; i++) {
    if (Files[i].fs == fs) Files[i].fs = 0;
  }
}
#endif




/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the file system object               */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync_window (   /* FR_OK:succeeded, !=0:error */
                     FATFS* fs      /* File system object */
                        )
{
  uint32_t wsect;
  uint32_t nf;
  FRESULT res = FR_OK;


  if (fs->wflag) {  /* Write back the sector if it is dirty */
    wsect = fs->winsect;    /* Current sector number */
    if (disk_write(fs->drv, fs->win, wsect, 1) != RES_OK) {
      res = FR_DISK_ERR;
    } else {
      fs->wflag = 0;
      if (wsect - fs->fatbase < fs->fsize) {        /* Is it in the FAT area? */
        for (nf = fs->n_fats; nf >= 2; nf--) {  /* Reflect the change to all FAT copies */
          wsect += fs->fsize;
          disk_write(fs->drv, fs->win, wsect, 1);
        }
      }
    }
  }
  return res;
}
#endif


static
FRESULT move_window (   /* FR_OK(0):succeeded, !=0:error */
                     FATFS* fs,        /* File system object */
                     uint32_t sector   /* Sector number to make appearance in the fs->win[] */
                        )
{
  FRESULT res = FR_OK;


  if (sector != fs->winsect) {  /* Window offset changed? */
#if !_FS_READONLY
    res = sync_window(fs);      /* Write-back changes */
#endif
    if (res == FR_OK) {         /* Fill sector window with new data */
      if (disk_read(fs->drv, fs->win, sector, 1) != RES_OK) {
        sector = 0xFFFFFFFF;    /* Invalidate window if data is not reliable */
        res = FR_DISK_ERR;
      }
      fs->winsect = sector;
    }
  }
  return res;
}




/*-----------------------------------------------------------------------*/
/* Synchronize file system and strage device                             */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync_fs (   /* FR_OK:succeeded, !=0:error */
                 FATFS* fs      /* File system object */
                    )
{
  FRESULT res;


  res = sync_window(fs);
  if (res == FR_OK) {
    /* Update FSInfo sector if needed */
    if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {
      /* Create FSInfo structure */
      mem_set(fs->win, 0, SS(fs));
      ST_WORD(fs->win + BS_55AA, 0xAA55);
      ST_DWORD(fs->win + FSI_LeadSig, 0x41615252);
      ST_DWORD(fs->win + FSI_StrucSig, 0x61417272);
      ST_DWORD(fs->win + FSI_Free_Count, fs->free_clust);
      ST_DWORD(fs->win + FSI_Nxt_Free, fs->last_clust);
      /* Write it into the FSInfo sector */
      fs->winsect = fs->volbase + 1;
      disk_write(fs->drv, fs->win, fs->winsect, 1);
      fs->fsi_flag = 0;
    }
    /* Make sure that no pending write process in the physical drive */
    if (disk_ioctl(fs->drv, CTRL_SYNC, 0) != RES_OK)
      res = FR_DISK_ERR;
  }

  return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/
/* Hidden API for hacks and disk tools */

uint32_t clust2sect (  /* !=0:Sector number, 0:Failed (invalid cluster#) */
                     FATFS* fs,           /* File system object */
                     uint32_t clst        /* Cluster# to be converted */
                       )
{
  clst -= 2;
  if (clst >= fs->n_fatent - 2) return 0;       /* Invalid cluster# */
  return clst * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/
/* Hidden API for hacks and disk tools */

uint32_t get_fat ( /* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x0FFFFFFF:Cluster status */
                  FATFS* fs,      /* File system object */
                  uint32_t clst   /* FAT index number (cluster number) to get the value */
                   )
{
  uint32_t wc, bc;
  uint8_t *p;
  uint32_t val;


  if (clst < 2 || clst >= fs->n_fatent) {   /* Check if in valid range */
    val = 1;    /* Internal error */

  } else {
    val = 0xFFFFFFFF;   /* Default value falls on disk error */

    switch (fs->fs_type) {
    case FS_FAT12 :
      bc = (uint32_t)clst; bc += bc / 2;
      if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
      wc = fs->win[bc++ % SS(fs)];
      if (move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK) break;
      wc |= fs->win[bc % SS(fs)] << 8;
      val = clst & 1 ? wc >> 4 : (wc & 0xFFF);
      break;

    case FS_FAT16 :
      if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK) break;
      p = &fs->win[clst * 2 % SS(fs)];
      val = LD_WORD(p);
      break;

    case FS_FAT32 :
      if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK) break;
      p = &fs->win[clst * 4 % SS(fs)];
      val = LD_DWORD(p) & 0x0FFFFFFF;
      break;

    default:
      val = 1;  /* Internal error */
    }
  }

  return val;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/
/* Hidden API for hacks and disk tools */

#if !_FS_READONLY
FRESULT put_fat (   /* FR_OK(0):succeeded, !=0:error */
                 FATFS* fs,        /* File system object */
                 uint32_t clst,    /* FAT index number (cluster number) to be changed */
                 uint32_t val      /* New value to be set to the entry */
                    )
{
  uint32_t bc;
  uint8_t *p;
  FRESULT res;


  if (clst < 2 || clst >= fs->n_fatent) {   /* Check if in valid range */
    res = FR_INT_ERR;

  } else {
    switch (fs->fs_type) {
    case FS_FAT12 :
      bc = (uint32_t)clst; bc += bc / 2;
      res = move_window(fs, fs->fatbase + (bc / SS(fs)));
      if (res != FR_OK) break;
      p = &fs->win[bc++ % SS(fs)];
      *p = (clst & 1) ? ((*p & 0x0F) | ((uint8_t)val << 4)) : (uint8_t)val;
      fs->wflag = 1;
      res = move_window(fs, fs->fatbase + (bc / SS(fs)));
      if (res != FR_OK) break;
      p = &fs->win[bc % SS(fs)];
      *p = (clst & 1) ? (uint8_t)(val >> 4) : ((*p & 0xF0) | ((uint8_t)(val >> 8) & 0x0F));
      fs->wflag = 1;
      break;

    case FS_FAT16 :
      res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
      if (res != FR_OK) break;
      p = &fs->win[clst * 2 % SS(fs)];
      ST_WORD(p, (uint16_t)val);
      fs->wflag = 1;
      break;

    case FS_FAT32 :
      res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
      if (res != FR_OK) break;
      p = &fs->win[clst * 4 % SS(fs)];
      val |= LD_DWORD(p) & 0xF0000000;
      ST_DWORD(p, val);
      fs->wflag = 1;
      break;

    default :
      res = FR_INT_ERR;
    }
  }

  return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT remove_chain (  /* FR_OK(0):succeeded, !=0:error */
                      FATFS* fs,            /* File system object */
                      uint32_t clst         /* Cluster# to remove a chain from */
                        )
{
  FRESULT res;
  uint32_t nxt;
#if _USE_TRIM
  uint32_t scl = clst, ecl = clst, rt[2];
#endif

  if (clst < 2 || clst >= fs->n_fatent) {   /* Check if in valid range */
    res = FR_INT_ERR;

  } else {
    res = FR_OK;
    while (clst < fs->n_fatent) {       /* Not a last link? */
      nxt = get_fat(fs, clst);          /* Get cluster status */
      if (nxt == 0) break;              /* Empty cluster? */
      if (nxt == 1) { res = FR_INT_ERR; break; }    /* Internal error? */
      if (nxt == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }  /* Disk error? */
      res = put_fat(fs, clst, 0);           /* Mark the cluster "empty" */
      if (res != FR_OK) break;
      if (fs->free_clust != 0xFFFFFFFF) {   /* Update FSINFO */
        fs->free_clust++;
        fs->fsi_flag |= 1;
      }
#if _USE_TRIM
      if (ecl + 1 == nxt) { /* Is next cluster contiguous? */
        ecl = nxt;
      } else {              /* End of contiguous clusters */ 
        rt[0] = clust2sect(fs, scl);                    /* Start sector */
        rt[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
        disk_ioctl(fs->drv, CTRL_TRIM, rt);             /* Erase the block */
        scl = ecl = nxt;
      }
#endif
      clst = nxt;   /* Next cluster */
    }
  }

  return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch or Create a cluster chain                      */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
uint32_t create_chain (    /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
                       FATFS* fs,          /* File system object */
                       uint32_t clst       /* Cluster# to stretch, 0:Create a new chain */
                           )
{
  uint32_t cs, ncl, scl;
  FRESULT res;


  if (clst == 0) {      /* Create a new chain */
    scl = fs->last_clust;           /* Get suggested start point */
    if (!scl || scl >= fs->n_fatent) scl = 1;
  }
  else {                    /* Stretch the current chain */
    cs = get_fat(fs, clst);         /* Check the cluster status */
    if (cs < 2) return 1;           /* Invalid value */
    if (cs == 0xFFFFFFFF) return cs;    /* A disk error occurred */
    if (cs < fs->n_fatent) return cs;   /* It is already followed by next cluster */
    scl = clst;
  }

  ncl = scl;                /* Start cluster */
  for (;;) {
    ncl++;                          /* Next cluster */
    if (ncl >= fs->n_fatent) {      /* Check wrap around */
      ncl = 2;
      if (ncl > scl) return 0;  /* No free cluster */
    }
    cs = get_fat(fs, ncl);          /* Get the cluster status */
    if (cs == 0) break;             /* Found a free cluster */
    if (cs == 0xFFFFFFFF || cs == 1)/* An error occurred */
      return cs;
    if (ncl == scl) return 0;       /* No free cluster */
  }

  res = put_fat(fs, ncl, 0x0FFFFFFF);   /* Mark the new cluster "last link" */
  if (res == FR_OK && clst != 0) {
    res = put_fat(fs, clst, ncl);   /* Link it to the previous one if needed */
  }
  if (res == FR_OK) {
    fs->last_clust = ncl;           /* Update FSINFO */
    if (fs->free_clust != 0xFFFFFFFF) {
      fs->free_clust--;
      fs->fsi_flag |= 1;
    }
  } else {
    ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
  }

  return ncl;       /* Return new cluster number or error code */
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT handling - Convert offset into cluster with link map table        */
/*-----------------------------------------------------------------------*/

#if _USE_FASTSEEK
static
uint32_t clmt_clust (  /* <2:Error, >=2:Cluster number */
                     FIL* fp,      /* Pointer to the file object */
                     uint32_t ofs     /* File offset to be converted to cluster# */
                       )
{
  uint32_t cl, ncl, *tbl;


  tbl = fp->cltbl + 1;  /* Top of CLMT */
  cl = ofs / SS(fp->fs) / fp->fs->csize;    /* Cluster order from top of the file */
  for (;;) {
    ncl = *tbl++;           /* Number of cluters in the fragment */
    if (!ncl) return 0;     /* End of table? (error) */
    if (cl < ncl) break;    /* In this fragment? */
    cl -= ncl; tbl++;       /* Next fragment */
  }
  return cl + *tbl; /* Return the cluster number */
}
#endif  /* _USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_sdi (   /* FR_OK(0):succeeded, !=0:error */
                 DIR* dp,           /* Pointer to directory object */
                 uint32_t idx       /* Index of directory table */
                    )
{
  uint32_t clst, sect;
  uint32_t ic;


  dp->index = (uint16_t)idx;    /* Current index */
  clst = dp->sclust;            /* Table start cluster (0:root) */
  if (clst == 1 || clst >= dp->fs->n_fatent)    /* Check start cluster range */
    return FR_INT_ERR;
  if (!clst && dp->fs->fs_type == FS_FAT32) /* Replace cluster# 0 with root cluster# if in FAT32 */
    clst = dp->fs->dirbase;

  if (clst == 0) {  /* Static table (root-directory in FAT12/16) */
    if (idx >= dp->fs->n_rootdir)   /* Is index out of range? */
      return FR_INT_ERR;
    sect = dp->fs->dirbase;
  }
  else {                /* Dynamic table (root-directory in FAT32 or sub-directory) */
    ic = SS(dp->fs) / SZ_DIRE * dp->fs->csize;  /* Entries per cluster */
    while (idx >= ic) { /* Follow cluster chain */
      clst = get_fat(dp->fs, clst);             /* Get next cluster */
      if (clst == 0xFFFFFFFF) return FR_DISK_ERR;   /* Disk error */
      if (clst < 2 || clst >= dp->fs->n_fatent) /* Reached to end of table or internal error */
        return FR_INT_ERR;
      idx -= ic;
    }
    sect = clust2sect(dp->fs, clst);
  }
  dp->clust = clst; /* Current cluster# */
  if (!sect) return FR_INT_ERR;
  dp->sect = sect + idx / (SS(dp->fs) / SZ_DIRE);                   /* Sector# of the directory entry */
  dp->dir = dp->fs->win + (idx % (SS(dp->fs) / SZ_DIRE)) * SZ_DIRE; /* Ptr to the entry in the sector */

  return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory table index next                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next (  /* FR_OK(0):succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
                  DIR* dp,          /* Pointer to the directory object */
                  int stretch       /* 0: Do not stretch table, 1: Stretch table if needed */
                    )
{
  uint32_t clst;
  uint32_t i;
#if !_FS_READONLY
  uint32_t c;
#endif


  i = dp->index + 1;
  if (!(i & 0xFFFF) || !dp->sect)   /* Report EOT when index has reached 65535 */
    return FR_NO_FILE;

  if (!(i % (SS(dp->fs) / SZ_DIRE))) {  /* Sector changed? */
    dp->sect++;                 /* Next sector */

    if (!dp->clust) {       /* Static table */
      if (i >= dp->fs->n_rootdir)   /* Report EOT if it reached end of static table */
        return FR_NO_FILE;
    }
    else {                  /* Dynamic table */
      if (((i / (SS(dp->fs) / SZ_DIRE)) & (dp->fs->csize - 1)) == 0) {  /* Cluster changed? */
        clst = get_fat(dp->fs, dp->clust);              /* Get next cluster */
        if (clst <= 1) return FR_INT_ERR;
        if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
        if (clst >= dp->fs->n_fatent) {                 /* If it reached end of dynamic table, */
#if !_FS_READONLY
          if (!stretch) return FR_NO_FILE;          /* If do not stretch, report EOT */
          clst = create_chain(dp->fs, dp->clust);       /* Stretch cluster chain */
          if (clst == 0) return FR_DENIED;          /* No free cluster */
          if (clst == 1) return FR_INT_ERR;
          if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
          /* Clean-up stretched table */
          if (sync_window(dp->fs)) return FR_DISK_ERR;/* Flush disk access window */
          mem_set(dp->fs->win, 0, SS(dp->fs));      /* Clear window buffer */
          dp->fs->winsect = clust2sect(dp->fs, clst);   /* Cluster start sector */
          for (c = 0; c < dp->fs->csize; c++) {     /* Fill the new cluster with 0 */
            dp->fs->wflag = 1;
            if (sync_window(dp->fs)) return FR_DISK_ERR;
            dp->fs->winsect++;
          }
          dp->fs->winsect -= c;                     /* Rewind window offset */
#else
          if (!stretch) return FR_NO_FILE;          /* If do not stretch, report EOT (this is to suppress warning) */
          return FR_NO_FILE;                            /* Report EOT */
#endif
        }
        dp->clust = clst;               /* Initialize data for new cluster */
        dp->sect = clust2sect(dp->fs, clst);
      }
    }
  }

  dp->index = (uint16_t)i;  /* Current index */
  dp->dir = dp->fs->win + (i % (SS(dp->fs) / SZ_DIRE)) * SZ_DIRE;   /* Current entry in the window */

  return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve directory entry                          */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
FRESULT dir_alloc ( /* FR_OK(0):succeeded, !=0:error */
                   DIR* dp,             /* Pointer to the directory object */
                   uint32_t nent        /* Number of contiguous entries to allocate (1-21) */
                    )
{
  FRESULT res;
  uint32_t n;


  res = dir_sdi(dp, 0);
  if (res == FR_OK) {
    n = 0;
    do {
      res = move_window(dp->fs, dp->sect);
      if (res != FR_OK) break;
      if (dp->dir[0] == DDEM || dp->dir[0] == 0) {  /* Is it a free entry? */
        if (++n == nent) break; /* A block of contiguous free entries is found */
      } else {
        n = 0;                  /* Not a blank entry. Restart to search */
      }
      res = dir_next(dp, 1);    /* Next entry with table stretch enabled */
    } while (res == FR_OK);
  }
  if (res == FR_NO_FILE) res = FR_DENIED;   /* No directory entry to allocate */
  return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Load/Store start cluster number                  */
/*-----------------------------------------------------------------------*/

static
uint32_t ld_clust (    /* Returns the top cluster value of the SFN entry */
                   FATFS* fs,         /* Pointer to the fs object */
                   const uint8_t* dir /* Pointer to the SFN entry */
                       )
{
  uint32_t cl;

  cl = LD_WORD(dir + DIR_FstClusLO);
  if (fs->fs_type == FS_FAT32)
    cl |= (uint32_t)LD_WORD(dir + DIR_FstClusHI) << 16;

  return cl;
}


#if !_FS_READONLY
static
void st_clust (
               uint8_t* dir,   /* Pointer to the SFN entry */
               uint32_t cl     /* Value to be set */
               )
{
  ST_WORD(dir + DIR_FstClusLO, cl);
  ST_WORD(dir + DIR_FstClusHI, cl >> 16);
}
#endif




/*-----------------------------------------------------------------------*/
/* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry   */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
const uint8_t LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};  /* Offset of LFN characters in the directory entry */


static
int cmp_lfn (           /* 1:matched, 0:not matched */
             uint16_t* lfnbuf,     /* Pointer to the LFN working buffer to be compared */
             uint8_t* dir          /* Pointer to the directory entry containing the part of LFN */
                        )
{
  uint32_t i, s;
  uint16_t wc, uc;


  if (LD_WORD(dir + LDIR_FstClusLO) != 0) return 0; /* Check LDIR_FstClusLO */

  i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;    /* Offset in the LFN buffer */

  for (wc = 1, s = 0; s < 13; s++) {    /* Process all characters in the entry */
    uc = LD_WORD(dir + LfnOfs[s]);      /* Pick an LFN character */
    if (wc) {
      if (i >= _MAX_LFN || ff_wtoupper(uc) != ff_wtoupper(lfnbuf[i++])) /* Compare it */
        return 0;                   /* Not matched */
      wc = uc;
    } else {
      if (uc != 0xFFFF) return 0;       /* Check filler */
    }
  }

  if ((dir[LDIR_Ord] & LLEF) && wc && lfnbuf[i])    /* Last segment matched but different length */
    return 0;

  return 1;     /* The part of LFN matched */
}



static
int pick_lfn (          /* 1:succeeded, 0:buffer overflow or invalid LFN entry */
              uint16_t* lfnbuf,    /* Pointer to the LFN working buffer */
              uint8_t* dir         /* Pointer to the LFN entry */
                        )
{
  uint32_t i, s;
  uint16_t wc, uc;


  if (LD_WORD(dir + LDIR_FstClusLO) != 0) return 0; /* Check LDIR_FstClusLO */

  i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;    /* Offset in the LFN buffer */

  for (wc = 1, s = 0; s < 13; s++) {        /* Process all characters in the entry */
    uc = LD_WORD(dir + LfnOfs[s]);      /* Pick an LFN character */
    if (wc) {
      if (i >= _MAX_LFN) return 0;      /* Buffer overflow? */
      lfnbuf[i++] = wc = uc;            /* Store it */
    } else {
      if (uc != 0xFFFF) return 0;       /* Check filler */
    }
  }

  if (dir[LDIR_Ord] & LLEF) {           /* Put terminator if it is the last LFN part */
    if (i >= _MAX_LFN) return 0;        /* Buffer overflow? */
    lfnbuf[i] = 0;
  }

  return 1;     /* The part of LFN is valid */
}


#if !_FS_READONLY
static
void fit_lfn (
              const uint16_t* lfnbuf,  /* Pointer to the LFN working buffer */
              uint8_t* dir,            /* Pointer to the LFN entry to be processed */
              uint8_t ord,             /* LFN order (1-20) */
              uint8_t sum              /* Checksum of the corresponding SFN */
              )
{
  uint32_t i, s;
  uint16_t wc;


  dir[LDIR_Chksum] = sum;       /* Set checksum */
  dir[LDIR_Attr] = AM_LFN;      /* Set attribute. LFN entry */
  dir[LDIR_Type] = 0;
  ST_WORD(dir + LDIR_FstClusLO, 0);

  i = (ord - 1) * 13;           /* Get offset in the LFN working buffer */
  s = wc = 0;
  do {
    if (wc != 0xFFFF) wc = lfnbuf[i++]; /* Get an effective character */
    ST_WORD(dir+LfnOfs[s], wc); /* Put it */
    if (!wc) wc = 0xFFFF;       /* Padding characters following last character */
  } while (++s < 13);
  if (wc == 0xFFFF || !lfnbuf[i]) ord |= LLEF;  /* Bottom LFN part is the start of LFN sequence */
  dir[LDIR_Ord] = ord;          /* Set the LFN order */
}

#endif
#endif




/*-----------------------------------------------------------------------*/
/* Create numbered name                                                  */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
void gen_numname (
                  uint8_t* dst,        /* Pointer to the buffer to store numbered SFN */
                  const uint8_t* src,  /* Pointer to SFN */
                  const uint16_t* lfn, /* Pointer to LFN */
                  uint32_t seq         /* Sequence number */
                  )
{
  uint8_t ns[8], c;
  uint32_t i, j;
  uint16_t wc;
  uint32_t sr;


  mem_cpy(dst, src, 11);

  if (seq > 5) {    /* On many collisions, generate a hash number instead of sequential number */
    sr = seq;
    while (*lfn) {  /* Create a CRC */
      wc = *lfn++;
      for (i = 0; i < 16; i++) {
        sr = (sr << 1) + (wc & 1);
        wc >>= 1;
        if (sr & 0x10000) sr ^= 0x11021;
      }
    }
    seq = (uint32_t)sr;
  }

  /* itoa (hexdecimal) */
  i = 7;
  do {
    c = (seq % 16) + '0';
    if (c > '9') c += 7;
    ns[i--] = c;
    seq /= 16;
  } while (seq);
  ns[i] = '~';

  /* Append the number */
  for (j = 0; j < i && dst[j] != ' '; j++) {
    if (IsDBCS1(dst[j])) {
      if (j == i - 1) break;
      j++;
    }
  }
  do {
    dst[j++] = (i < 8) ? ns[i++] : ' ';
  } while (j < 8);
}
#endif




/*-----------------------------------------------------------------------*/
/* Calculate checksum of an SFN entry                                    */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
uint8_t sum_sfn (
                 const uint8_t* dir       /* Pointer to the SFN entry */
                 )
{
  uint8_t sum = 0;
  uint32_t n = 11;

  do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n);
  return sum;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_find (  /* FR_OK(0):succeeded, !=0:error */
                  DIR* dp           /* Pointer to the directory object linked to the file name */
                    )
{
  FRESULT res;
  uint8_t c, *dir;
#if _USE_LFN
  uint8_t a, ord, sum;
#endif

  res = dir_sdi(dp, 0);         /* Rewind directory object */
  if (res != FR_OK) return res;

#if _USE_LFN
  ord = sum = 0xFF; dp->lfn_idx = 0xFFFF;   /* Reset LFN sequence */
#endif
  do {
    res = move_window(dp->fs, dp->sect);
    if (res != FR_OK) break;
    dir = dp->dir;                  /* Ptr to the directory entry of current index */
    c = dir[DIR_Name];
    if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
#if _USE_LFN    /* LFN configuration */
    a = dir[DIR_Attr] & AM_MASK;
    if (c == DDEM || ((a & AM_VOL) && a != AM_LFN)) {   /* An entry without valid data */
      ord = 0xFF; dp->lfn_idx = 0xFFFF; /* Reset LFN sequence */
    } else {
      if (a == AM_LFN) {            /* An LFN entry is found */
        if (dp->lfn) {
          if (c & LLEF) {       /* Is it start of LFN sequence? */
            sum = dir[LDIR_Chksum];
            c &= ~LLEF; ord = c;    /* LFN start order */
            dp->lfn_idx = dp->index;    /* Start index of LFN */
          }
          /* Check validity of the LFN entry and compare it with given name */
          ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
        }
      } else {                  /* An SFN entry is found */
        if (!ord && sum == sum_sfn(dir)) break; /* LFN matched? */
        if (!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dir, dp->fn, 11)) break;    /* SFN matched? */
        ord = 0xFF; dp->lfn_idx = 0xFFFF;   /* Reset LFN sequence */
      }
    }
#else       /* Non LFN configuration */
    if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dp->fn, 11)) /* Is it a valid entry? */
      break;
#endif
    res = dir_next(dp, 0);      /* Next entry */
  } while (res == FR_OK);

  return res;
}




/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2
static
FRESULT dir_read (
                  DIR* dp,      /* Pointer to the directory object */
                  int vol       /* Filtered by 0:file/directory or 1:volume label */
                  )
{
  FRESULT res;
  uint8_t a, c, *dir;
#if _USE_LFN
  uint8_t ord = 0xFF, sum = 0xFF;
#endif

  res = FR_NO_FILE;
  while (dp->sect) {
    res = move_window(dp->fs, dp->sect);
    if (res != FR_OK) break;
    dir = dp->dir;                  /* Ptr to the directory entry of current index */
    c = dir[DIR_Name];
    if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
    a = dir[DIR_Attr] & AM_MASK;
#if _USE_LFN    /* LFN configuration */
    if (c == DDEM || (!_FS_RPATH && c == '.') || (int)((a & ~AM_ARC) == AM_VOL) != vol) {   /* An entry without valid data */
      ord = 0xFF;
    } else {
      if (a == AM_LFN) {            /* An LFN entry is found */
        if (c & LLEF) {         /* Is it start of LFN sequence? */
          sum = dir[LDIR_Chksum];
          c &= ~LLEF; ord = c;
          dp->lfn_idx = dp->index;
        }
        /* Check LFN validity and capture it */
        ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
      } else {                  /* An SFN entry is found */
        if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */
          dp->lfn_idx = 0xFFFF;     /* It has no LFN. */
        break;
      }
    }
#else       /* Non LFN configuration */
    if (c != DDEM && (_FS_RPATH || c != '.') && a != AM_LFN && (int)((a & ~AM_ARC) == AM_VOL) == vol)   /* Is it a valid entry? */
      break;
#endif
    res = dir_next(dp, 0);              /* Next entry */
    if (res != FR_OK) break;
  }

  if (res != FR_OK) dp->sect = 0;

  return res;
}
#endif  /* _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2 */




/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT dir_register (  /* FR_OK:succeeded, FR_DENIED:no free entry or too many SFN collision, FR_DISK_ERR:disk error */
                      DIR* dp               /* Target directory with object name to be created */
                        )
{
  FRESULT res;
#if _USE_LFN    /* LFN configuration */
  uint32_t n, nent;
  uint8_t sn[12], *fn, sum;
  uint16_t *lfn;


  fn = dp->fn; lfn = dp->lfn;
  mem_cpy(sn, fn, 12);

  if (_FS_RPATH && (sn[NSFLAG] & NS_DOT))       /* Cannot create dot entry */
    return FR_INVALID_NAME;

  if (sn[NSFLAG] & NS_LOSS) {           /* When LFN is out of 8.3 format, generate a numbered name */
    fn[NSFLAG] = 0; dp->lfn = 0;        /* Find only SFN */
    for (n = 1; n < 100; n++) {
      gen_numname(fn, sn, lfn, n);      /* Generate a numbered name */
      res = dir_find(dp);               /* Check if the name collides with existing SFN */
      if (res != FR_OK) break;
    }
    if (n == 100) return FR_DENIED;     /* Abort if too many collisions */
    if (res != FR_NO_FILE) return res;  /* Abort if the result is other than 'not collided' */
    fn[NSFLAG] = sn[NSFLAG]; dp->lfn = lfn;
  }

  if (sn[NSFLAG] & NS_LFN) {            /* When LFN is to be created, allocate entries for an SFN + LFNs. */
    for (n = 0; lfn[n]; n++) ;
    nent = (n + 25) / 13;
  } else {                              /* Otherwise allocate an entry for an SFN  */
    nent = 1;
  }
  res = dir_alloc(dp, nent);            /* Allocate entries */

  if (res == FR_OK && --nent) {         /* Set LFN entry if needed */
    res = dir_sdi(dp, dp->index - nent);
    if (res == FR_OK) {
      sum = sum_sfn(dp->fn);            /* Checksum value of the SFN tied to the LFN */
      do {                              /* Store LFN entries in bottom first */
        res = move_window(dp->fs, dp->sect);
        if (res != FR_OK) break;
        fit_lfn(dp->lfn, dp->dir, (uint8_t)nent, sum);
        dp->fs->wflag = 1;
        res = dir_next(dp, 0);          /* Next entry */
      } while (res == FR_OK && --nent);
    }
  }
#else   /* Non LFN configuration */
  res = dir_alloc(dp, 1);               /* Allocate an entry for SFN */
#endif

  if (res == FR_OK) {                   /* Set SFN entry */
    res = move_window(dp->fs, dp->sect);
    if (res == FR_OK) {
      mem_set(dp->dir, 0, SZ_DIRE);     /* Clean the entry */
      mem_cpy(dp->dir, dp->fn, 11);     /* Put SFN */
#if _USE_LFN
      dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT); /* Put NT flag */
#endif
      dp->fs->wflag = 1;
    }
  }

  return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY && !_FS_MINIMIZE
static
FRESULT dir_remove (    /* FR_OK:Succeeded, FR_DISK_ERR:A disk error */
                    DIR* dp             /* Directory object pointing the entry to be removed */
                        )
{
  FRESULT res;
#if _USE_LFN    /* LFN configuration */
  uint32_t i;

  i = dp->index;    /* SFN index */
  res = dir_sdi(dp, (dp->lfn_idx == 0xFFFF) ? i : dp->lfn_idx); /* Goto the SFN or top of the LFN entries */
  if (res == FR_OK) {
    do {
      res = move_window(dp->fs, dp->sect);
      if (res != FR_OK) break;
      mem_set(dp->dir, 0, SZ_DIRE); /* Clear and mark the entry "deleted" */
      *dp->dir = DDEM;
      dp->fs->wflag = 1;
      if (dp->index >= i) break;    /* When reached SFN, all entries of the object has been deleted. */
      res = dir_next(dp, 0);        /* Next entry */
    } while (res == FR_OK);
    if (res == FR_NO_FILE) res = FR_INT_ERR;
  }

#else           /* Non LFN configuration */
  res = dir_sdi(dp, dp->index);
  if (res == FR_OK) {
    res = move_window(dp->fs, dp->sect);
    if (res == FR_OK) {
      mem_set(dp->dir, 0, SZ_DIRE); /* Clear and mark the entry "deleted" */
      *dp->dir = DDEM;
      dp->fs->wflag = 1;
    }
  }
#endif

  return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
static
void get_fileinfo (     /* No return code */
                   DIR* dp,         /* Pointer to the directory object */
                   FILINFO* fno     /* Pointer to the file information to be filled */
                        )
{
  uint32_t i;
  TCHAR *p, c;
  uint8_t *dir;
#if _USE_LFN
  uint16_t w, *lfn;
#endif

  p = fno->fname;
  if (dp->sect) {       /* Get SFN */
    dir = dp->dir;
    i = 0;
    while (i < 11) {        /* Copy name body and extension */
      c = (TCHAR)dir[i++];
      if (c == ' ') continue;           /* Skip padding spaces */
      if (c == RDDEM) c = (TCHAR)DDEM;  /* Restore replaced DDEM character */
      if (i == 9) *p++ = '.';           /* Insert a . if extension is exist */
#if _USE_LFN
      if (IsUpper(c) && (dir[DIR_NTres] & (i >= 9 ? NS_EXT : NS_BODY)))
        c += 0x20;          /* To lower */
#if _LFN_UNICODE
      if (IsDBCS1(c) && i != 8 && i != 11 && IsDBCS2(dir[i]))
        c = c << 8 | dir[i++];
      c = ff_convert(c, 1); /* OEM -> Unicode */
      if (!c) c = '?';
#endif
#endif
      *p++ = c;
    }
    fno->fattrib = dir[DIR_Attr];               /* Attribute */
    fno->fsize = LD_DWORD(dir + DIR_FileSize);  /* Size */
    fno->fdate = LD_WORD(dir + DIR_WrtDate);    /* Date */
    fno->ftime = LD_WORD(dir + DIR_WrtTime);    /* Time */
  }
  *p = 0;       /* Terminate SFN string by a \0 */

#if _USE_LFN
  if (fno->lfname) {
    i = 0; p = fno->lfname;
    if (dp->sect && fno->lfsize && dp->lfn_idx != 0xFFFF) { /* Get LFN if available */
      lfn = dp->lfn;
      while ((w = *lfn++) != 0) {   /* Get an LFN character */
#if !_LFN_UNICODE
        w = ff_convert(w, 0);       /* Unicode -> OEM */
        if (!w) { i = 0; break; }   /* No LFN if it could not be converted */
        if (_DF1S && w >= 0x100)    /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
          p[i++] = (TCHAR)(w >> 8);
#endif
        if (i >= fno->lfsize - 1) { i = 0; break; } /* No LFN if buffer overflow */
        p[i++] = (TCHAR)w;
      }
    }
    p[i] = 0;   /* Terminate LFN string by a \0 */
  }
#endif
}
#endif /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2 */




/*-----------------------------------------------------------------------*/
/* Pattern matching                                                      */
/*-----------------------------------------------------------------------*/
#if _USE_FIND && _FS_MINIMIZE <= 1
static
uint16_t get_achar (       /* Get a character and advances ptr 1 or 2 */
                    const TCHAR** ptr  /* Pointer to pointer to the SBCS/DBCS/Unicode string */
                           )
{
  uint16_t chr;

#if !_LFN_UNICODE
  chr = (uint8_t)*(*ptr)++;                 /* Get a byte */
  if (IsLower(chr)) chr -= 0x20;            /* To upper ASCII char */
  if (IsDBCS1(chr) && IsDBCS2(**ptr))       /* Get DBC 2nd byte if needed */
    chr = chr << 8 | (uint8_t)*(*ptr)++;
#ifdef _EXCVT
  if (chr >= 0x80) chr = ExCvt[chr - 0x80]; /* To upper SBCS extended char */
#endif
#else
  chr = ff_wtoupper(*(*ptr)++);         /* Get a word and to upper */
#endif
  return chr;
}


static
int pattern_matching (  /* 0:mismatched, 1:matched */
                      const TCHAR* pat, /* Matching pattern */
                      const TCHAR* nam, /* String to be tested */
                      int skip,         /* Number of pre-skip chars (number of ?s) */
                      int inf           /* Infinite search (* specified) */
                        )
{
  const TCHAR *pp, *np;
  uint16_t pc, nc;
  int nm, nx;


  while (skip--) {              /* Pre-skip name chars */
    if (!get_achar(&nam)) return 0; /* Branch mismatched if less name chars */
  }
  if (!*pat && inf) return 1;       /* (short circuit) */

  do {
    pp = pat; np = nam;         /* Top of pattern and name to match */
    for (;;) {
      if (*pp == '?' || *pp == '*') {   /* Wildcard? */
        nm = nx = 0;
        do {                /* Analyze the wildcard chars */
          if (*pp++ == '?') nm++; else nx = 1;
        } while (*pp == '?' || *pp == '*');
        if (pattern_matching(pp, np, nm, nx)) return 1; /* Test new branch (recurs upto number of wildcard blocks in the pattern) */
        nc = *np; break;    /* Branch mismatched */
      }
      pc = get_achar(&pp);  /* Get a pattern char */
      nc = get_achar(&np);  /* Get a name char */
      if (pc != nc) break;  /* Branch mismatched? */
      if (!pc) return 1;        /* Branch matched? (matched at end of both strings) */
    }
    get_achar(&nam);            /* nam++ */
  } while (inf && nc);          /* Retry until end of name if infinite search is specified */

  return 0;
}
#endif /* _USE_FIND && _FS_MINIMIZE <= 1 */




/*-----------------------------------------------------------------------*/
/* Pick a top segment and create the object name in directory form       */
/*-----------------------------------------------------------------------*/

static
FRESULT create_name (   /* FR_OK: successful, FR_INVALID_NAME: could not create */
                     DIR* dp,           /* Pointer to the directory object */
                     const TCHAR** path /* Pointer to pointer to the segment in the path string */
                        )
{
#if _USE_LFN    /* LFN configuration */
  uint8_t b, cf;
  uint16_t w, *lfn;
  uint32_t i, ni, si, di;
  const TCHAR *p;

  /* Create LFN in Unicode */
  for (p = *path; *p == '/' || *p == '\\'; p++) ;   /* Strip duplicated separator */
  lfn = dp->lfn;
  si = di = 0;
  for (;;) {
    w = p[si++];                    /* Get a character */
    if (w < ' ' || w == '/' || w == '\\') break;    /* Break on end of segment */
    if (di >= _MAX_LFN)             /* Reject too long name */
      return FR_INVALID_NAME;
#if !_LFN_UNICODE
    w &= 0xFF;
    if (IsDBCS1(w)) {               /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
      b = (uint8_t)p[si++];            /* Get 2nd byte */
      w = (w << 8) + b;         /* Create a DBC */
      if (!IsDBCS2(b))
        return FR_INVALID_NAME; /* Reject invalid sequence */
    }
    w = ff_convert(w, 1);           /* Convert ANSI/OEM to Unicode */
    if (!w) return FR_INVALID_NAME; /* Reject invalid code */
#endif
    if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal characters for LFN */
      return FR_INVALID_NAME;
    lfn[di++] = w;                  /* Store the Unicode character */
  }
  *path = &p[si];                       /* Return pointer to the next segment */
  cf = (w < ' ') ? NS_LAST : 0;     /* Set last segment flag if end of path */
#if _FS_RPATH
  if ((di == 1 && lfn[di - 1] == '.') ||
      (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.')) {  /* Is this segment a dot entry? */
    lfn[di] = 0;
    for (i = 0; i < 11; i++)        /* Create dot name for SFN entry */
      dp->fn[i] = (i < di) ? '.' : ' ';
    dp->fn[i] = cf | NS_DOT;        /* This is a dot entry */
    return FR_OK;
  }
#endif
  while (di) {                      /* Snip off trailing spaces and dots if exist */
    w = lfn[di - 1];
    if (w != ' ' && w != '.') break;
    di--;
  }
  if (!di) return FR_INVALID_NAME;  /* Reject nul string */
  lfn[di] = 0;                      /* LFN is created */

  /* Create SFN in directory form */
  mem_set(dp->fn, ' ', 11);
  for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ;    /* Strip leading spaces and dots */
  if (si) cf |= NS_LOSS | NS_LFN;
  while (di && lfn[di - 1] != '.') di--;    /* Find extension (di<=si: no extension) */

  b = i = 0; ni = 8;
  for (;;) {
    w = lfn[si++];                  /* Get an LFN character */
    if (!w) break;                  /* Break on end of the LFN */
    if (w == ' ' || (w == '.' && si != di)) {   /* Remove spaces and dots */
      cf |= NS_LOSS | NS_LFN; continue;
    }

    if (i >= ni || si == di) {      /* Extension or end of SFN */
      if (ni == 11) {               /* Long extension */
        cf |= NS_LOSS | NS_LFN; break;
      }
      if (si != di) cf |= NS_LOSS | NS_LFN; /* Out of 8.3 format */
      if (si > di) break;           /* No extension */
      si = di; i = 8; ni = 11;  /* Enter extension section */
      b <<= 2; continue;
    }

    if (w >= 0x80) {                /* Non ASCII character */
#ifdef _EXCVT
      w = ff_convert(w, 0);     /* Unicode -> OEM code */
      if (w) w = ExCvt[w - 0x80];   /* Convert extended character to upper (SBCS) */
#else
      w = ff_convert(ff_wtoupper(w), 0);    /* Upper converted Unicode -> OEM code */
#endif
      cf |= NS_LFN;             /* Force create LFN entry */
    }

    if (_DF1S && w >= 0x100) {      /* Is this DBC? (always false at SBCS cfg) */
      if (i >= ni - 1) {
        cf |= NS_LOSS | NS_LFN; i = ni; continue;
      }
      dp->fn[i++] = (uint8_t)(w >> 8);
    } else {                        /* SBC */
      if (!w || chk_chr("+,;=[]", w)) { /* Replace illegal characters for SFN */
        w = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
      } else {
        if (IsUpper(w)) {       /* ASCII large capital */
          b |= 2;
        } else {
          if (IsLower(w)) { /* ASCII small capital */
            b |= 1; w -= 0x20;
          }
        }
      }
    }
    dp->fn[i++] = (uint8_t)w;
  }

  if (dp->fn[0] == DDEM) dp->fn[0] = RDDEM; /* If the first character collides with DDEM, replace it with RDDEM */

  if (ni == 8) b <<= 2;
  if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03) /* Create LFN entry when there are composite capitals */
    cf |= NS_LFN;
  if (!(cf & NS_LFN)) {                     /* When LFN is in 8.3 format without extended character, NT flags are created */
    if ((b & 0x03) == 0x01) cf |= NS_EXT;   /* NT flag (Extension has only small capital) */
    if ((b & 0x0C) == 0x04) cf |= NS_BODY;  /* NT flag (Filename has only small capital) */
  }

  dp->fn[NSFLAG] = cf;  /* SFN is created */

  return FR_OK;


#else   /* Non-LFN configuration */
  uint8_t b, c, d, *sfn;
  uint32_t ni, si, i;
  const char *p;

  /* Create file name in directory form */
  for (p = *path; *p == '/' || *p == '\\'; p++) ;   /* Skip duplicated separator */
  sfn = dp->fn;
  mem_set(sfn, ' ', 11);
  si = i = b = 0; ni = 8;
#if _FS_RPATH
  if (p[si] == '.') { /* Is this a dot entry? */
    for (;;) {
      c = (uint8_t)p[si++];
      if (c != '.' || si >= 3) break;
      sfn[i++] = c;
    }
    if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
    *path = &p[si];                                 /* Return pointer to the next segment */
    sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;   /* Set last segment flag if end of path */
    return FR_OK;
  }
#endif
  for (;;) {
    c = (uint8_t)p[si++];
    if (c <= ' ' || c == '/' || c == '\\') break;   /* Break on end of segment */
    if (c == '.' || i >= ni) {
      if (ni != 8 || c != '.') return FR_INVALID_NAME;
      i = 8; ni = 11;
      b <<= 2; continue;
    }
    if (c >= 0x80) {                /* Extended character? */
      b |= 3;                       /* Eliminate NT flag */
#ifdef _EXCVT
      c = ExCvt[c - 0x80];          /* To upper extended characters (SBCS cfg) */
#else
#if !_DF1S
      return FR_INVALID_NAME;       /* Reject extended characters (ASCII cfg) */
#endif
#endif
    }
    if (IsDBCS1(c)) {               /* Check if it is a DBC 1st byte (always false at SBCS cfg.) */
      d = (uint8_t)p[si++];            /* Get 2nd byte */
      if (!IsDBCS2(d) || i >= ni - 1)   /* Reject invalid DBC */
        return FR_INVALID_NAME;
      sfn[i++] = c;
      sfn[i++] = d;
    } else {                        /* SBC */
      if (chk_chr("\"*+,:;<=>\?[]|\x7F", c))    /* Reject illegal chrs for SFN */
        return FR_INVALID_NAME;
      if (IsUpper(c)) {         /* ASCII large capital? */
        b |= 2;
      } else {
        if (IsLower(c)) {       /* ASCII small capital? */
          b |= 1; c -= 0x20;
        }
      }
      sfn[i++] = c;
    }
  }
  *path = &p[si];                       /* Return pointer to the next segment */
  c = (c <= ' ') ? NS_LAST : 0;         /* Set last segment flag if end of path */

  if (!i) return FR_INVALID_NAME;       /* Reject nul string */
  if (sfn[0] == DDEM) sfn[0] = RDDEM;   /* When first character collides with DDEM, replace it with RDDEM */

  if (ni == 8) b <<= 2;
  if ((b & 0x03) == 0x01) c |= NS_EXT;  /* NT flag (Name extension has only small capital) */
  if ((b & 0x0C) == 0x04) c |= NS_BODY; /* NT flag (Name body has only small capital) */

  sfn[NSFLAG] = c;      /* Store NT flag, File name is created */

  return FR_OK;
#endif
}




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path (   /* FR_OK(0): successful, !=0: error code */
                     DIR* dp,           /* Directory object to return last directory and found object */
                     const TCHAR* path  /* Full-path string to find a file or directory */
                        )
{
  FRESULT res;
  uint8_t *dir, ns;


#if _FS_RPATH
  if (*path == '/' || *path == '\\') {  /* There is a heading separator */
    path++; dp->sclust = 0;             /* Strip it and start from the root directory */
  } else {                              /* No heading separator */
    dp->sclust = dp->fs->cdir;          /* Start from the current directory */
  }
#else
  if (*path == '/' || *path == '\\')    /* Strip heading separator if exist */
    path++;
  dp->sclust = 0;                       /* Always start from the root directory */
#endif

  if ((uint32_t)*path < ' ') {          /* Null path name is the origin directory itself */
    res = dir_sdi(dp, 0);
    dp->dir = 0;
  } else {                              /* Follow path */
    for (;;) {
      res = create_name(dp, &path); /* Get a segment name of the path */
      if (res != FR_OK) break;
      res = dir_find(dp);               /* Find an object with the sagment name */
      ns = dp->fn[NSFLAG];
      if (res != FR_OK) {               /* Failed to find the object */
        if (res == FR_NO_FILE) {    /* Object is not found */
          if (_FS_RPATH && (ns & NS_DOT)) { /* If dot entry is not exist, */
            dp->sclust = 0; dp->dir = 0;    /* it is the root directory and stay there */
            if (!(ns & NS_LAST)) continue;  /* Continue to follow if not last segment */
            res = FR_OK;                    /* Ended at the root directroy. Function completed. */
          } else {                          /* Could not find the object */
            if (!(ns & NS_LAST)) res = FR_NO_PATH;  /* Adjust error code if not last segment */
          }
        }
        break;
      }
      if (ns & NS_LAST) break;          /* Last segment matched. Function completed. */
      dir = dp->dir;                    /* Follow the sub-directory */
      if (!(dir[DIR_Attr] & AM_DIR)) {  /* It is not a sub-directory and cannot follow */
        res = FR_NO_PATH; break;
      }
      dp->sclust = ld_clust(dp->fs, dir);
    }
  }

  return res;
}




/*-----------------------------------------------------------------------*/
/* Get logical drive number from path name                               */
/*-----------------------------------------------------------------------*/

static
int get_ldnumber (      /* Returns logical drive number (-1:invalid drive) */
                  const TCHAR** path    /* Pointer to pointer to the path name */
                        )
{
  const TCHAR *tp, *tt;
  uint32_t i;
  int vol = -1;
#if _STR_VOLUME_ID      /* Find string drive id */
  static const char* const str[] = {_VOLUME_STRS};
  const char *sp;
  char c;
  TCHAR tc;
#endif


  if (*path) {  /* If the pointer is not a null */
    for (tt = *path; (uint32_t)*tt >= (_USE_LFN ? ' ' : '!') && *tt != ':'; tt++) ; /* Find ':' in the path */
    if (*tt == ':') {   /* If a ':' is exist in the path name */
      tp = *path;
      i = *tp++ - '0'; 
      if (i < 10 && tp == tt) { /* Is there a numeric drive id? */
        if (i < _VOLUMES) { /* If a drive id is found, get the value and strip it */
          vol = (int)i;
          *path = ++tt;
        }
      }
#if _STR_VOLUME_ID
      else {    /* No numeric drive number, find string drive id */
        i = 0; tt++;
        do {
          sp = str[i]; tp = *path;
          do {  /* Compare a string drive id with path name */
            c = *sp++; tc = *tp++;
            if (IsLower(tc)) tc -= 0x20;
          } while (c && (TCHAR)c == tc);
        } while ((c || tp != tt) && ++i < _VOLUMES);    /* Repeat for each id until pattern match */
        if (i < _VOLUMES) { /* If a drive id is found, get the value and strip it */
          vol = (int)i;
          *path = tt;
        }
      }
#endif
      return vol;
    }
#if _FS_RPATH && _VOLUMES >= 2
    vol = CurrVol;  /* Current drive */
#else
    vol = 0;        /* Drive 0 */
#endif
  }
  return vol;
}




/*-----------------------------------------------------------------------*/
/* Load a sector and check if it is an FAT boot sector                   */
/*-----------------------------------------------------------------------*/

static
uint8_t check_fs ( /* 0:Valid FAT-BS, 1:Valid BS but not FAT, 2:Not a BS, 3:Disk error */
                  FATFS* fs,      /* File system object */
                  uint32_t sect   /* Sector# (lba) to check if it is an FAT boot record or not */
                   )
{
  fs->wflag = 0; fs->winsect = 0xFFFFFFFF;  /* Invaidate window */
  if (move_window(fs, sect) != FR_OK)       /* Load boot record */
    return 3;

  if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check boot record signature (always placed at offset 510 even if the sector size is >512) */
    return 2;

  if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146)       /* Check "FAT" string */
    return 0;
  if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146) /* Check "FAT" string */
    return 0;

  return 1;
}




/*-----------------------------------------------------------------------*/
/* Find logical drive and check if the volume is mounted                 */
/*-----------------------------------------------------------------------*/

static
FRESULT find_volume (   /* FR_OK(0): successful, !=0: any error occurred */
                     FATFS** rfs,           /* Pointer to pointer to the found file system object */
                     const TCHAR** path,    /* Pointer to pointer to the path name (drive number) */
                     uint8_t wmode          /* !=0: Check write protection for write access */
                        )
{
  uint8_t fmt, *pt;
  int vol;
  DSTATUS stat;
  uint32_t bsect, fasize, tsect, sysect, nclst, szbfat, br[4];
  uint16_t nrsv;
  FATFS *fs;
  uint32_t i;


  /* Get logical drive number from the path name */
  *rfs = 0;
  vol = get_ldnumber(path);
  if (vol < 0) return FR_INVALID_DRIVE;

  /* Check if the file system object is valid or not */
  fs = FatFs[vol];                      /* Get pointer to the file system object */
  if (!fs) return FR_NOT_ENABLED;       /* Is the file system object available? */

  ENTER_FF(fs);                         /* Lock the volume */
  *rfs = fs;                            /* Return pointer to the file system object */

  if (fs->fs_type) {                    /* If the volume has been mounted */
    stat = disk_status(fs->drv);
    if (!(stat & STA_NOINIT)) {     /* and the physical drive is kept initialized */
      if (!_FS_READONLY && wmode && (stat & STA_PROTECT))   /* Check write protection if needed */
        return FR_WRITE_PROTECTED;
      return FR_OK;             /* The file system object is valid */
    }
  }

  /* The file system object is not valid. */
  /* Following code attempts to mount the volume. (analyze BPB and initialize the fs object) */

  fs->fs_type = 0;                  /* Clear the file system object */
  fs->drv = LD2PD(vol);             /* Bind the logical drive and a physical drive */
  stat = disk_initialize(fs->drv);  /* Initialize the physical drive */
  if (stat & STA_NOINIT)                /* Check if the initialization succeeded */
    return FR_NOT_READY;            /* Failed to initialize due to no medium or hard error */
  if (!_FS_READONLY && wmode && (stat & STA_PROTECT))   /* Check disk write protection if needed */
    return FR_WRITE_PROTECTED;
#if _MAX_SS != _MIN_SS                      /* Get sector size (multiple sector size cfg only) */
  if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK
      || SS(fs) < _MIN_SS || SS(fs) > _MAX_SS) return FR_DISK_ERR;
#endif
  /* Find an FAT partition on the drive. Supports only generic partitioning, FDISK and SFD. */
  bsect = 0;
  fmt = check_fs(fs, bsect);                    /* Load sector 0 and check if it is an FAT boot sector as SFD */
  if (fmt == 1 || (!fmt && (LD2PT(vol)))) { /* Not an FAT boot sector or forced partition number */
    for (i = 0; i < 4; i++) {           /* Get partition offset */
      pt = fs->win + MBR_Table + i * SZ_PTE;
      br[i] = pt[4] ? LD_DWORD(&pt[8]) : 0;
    }
    i = LD2PT(vol);                     /* Partition number: 0:auto, 1-4:forced */
    if (i) i--;
    do {                                /* Find an FAT volume */
      bsect = br[i];
      fmt = bsect ? check_fs(fs, bsect) : 2;    /* Check the partition */
    } while (!LD2PT(vol) && fmt && ++i < 4);
  }
  if (fmt == 3) return FR_DISK_ERR;     /* An error occured in the disk I/O layer */
  if (fmt) return FR_NO_FILESYSTEM;     /* No FAT volume is found */

  /* An FAT volume is found. Following code initializes the file system object */

  if (LD_WORD(fs->win + BPB_BytsPerSec) != SS(fs))  /* (BPB_BytsPerSec must be equal to the physical sector size) */
    return FR_NO_FILESYSTEM;

  fasize = LD_WORD(fs->win + BPB_FATSz16);          /* Number of sectors per FAT */
  if (!fasize) fasize = LD_DWORD(fs->win + BPB_FATSz32);
  fs->fsize = fasize;

  fs->n_fats = fs->win[BPB_NumFATs];                    /* Number of FAT copies */
  if (fs->n_fats != 1 && fs->n_fats != 2)               /* (Must be 1 or 2) */
    return FR_NO_FILESYSTEM;
  fasize *= fs->n_fats;                             /* Number of sectors for FAT area */

  fs->csize = fs->win[BPB_SecPerClus];              /* Number of sectors per cluster */
  if (!fs->csize || (fs->csize & (fs->csize - 1)))  /* (Must be power of 2) */
    return FR_NO_FILESYSTEM;

  fs->n_rootdir = LD_WORD(fs->win + BPB_RootEntCnt);    /* Number of root directory entries */
  if (fs->n_rootdir % (SS(fs) / SZ_DIRE))               /* (Must be sector aligned) */
    return FR_NO_FILESYSTEM;

  tsect = LD_WORD(fs->win + BPB_TotSec16);          /* Number of sectors on the volume */
  if (!tsect) tsect = LD_DWORD(fs->win + BPB_TotSec32);

  nrsv = LD_WORD(fs->win + BPB_RsvdSecCnt);         /* Number of reserved sectors */
  if (!nrsv) return FR_NO_FILESYSTEM;                   /* (Must not be 0) */

  /* Determine the FAT sub type */
  sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZ_DIRE);  /* RSV + FAT + DIR */
  if (tsect < sysect) return FR_NO_FILESYSTEM;      /* (Invalid volume size) */
  nclst = (tsect - sysect) / fs->csize;             /* Number of clusters */
  if (!nclst) return FR_NO_FILESYSTEM;              /* (Invalid volume size) */
  fmt = FS_FAT12;
  if (nclst >= MIN_FAT16) fmt = FS_FAT16;
  if (nclst >= MIN_FAT32) fmt = FS_FAT32;

  /* Boundaries and Limits */
  fs->n_fatent = nclst + 2;                         /* Number of FAT entries */
  fs->volbase = bsect;                              /* Volume start sector */
  fs->fatbase = bsect + nrsv;                       /* FAT start sector */
  fs->database = bsect + sysect;                        /* Data start sector */
  if (fmt == FS_FAT32) {
    if (fs->n_rootdir) return FR_NO_FILESYSTEM;     /* (BPB_RootEntCnt must be 0) */
    fs->dirbase = LD_DWORD(fs->win + BPB_RootClus); /* Root directory start cluster */
    szbfat = fs->n_fatent * 4;                      /* (Needed FAT size) */
  } else {
    if (!fs->n_rootdir) return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must not be 0) */
    fs->dirbase = fs->fatbase + fasize;             /* Root directory start sector */
    szbfat = (fmt == FS_FAT16) ?                    /* (Needed FAT size) */
      fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
  }
  if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs)) /* (BPB_FATSz must not be less than the size needed) */
    return FR_NO_FILESYSTEM;

#if !_FS_READONLY
  /* Initialize cluster allocation information */
  fs->last_clust = fs->free_clust = 0xFFFFFFFF;

  /* Get fsinfo if available */
  fs->fsi_flag = 0x80;
#if (_FS_NOFSINFO & 3) != 3
  if (fmt == FS_FAT32               /* Enable FSINFO only if FAT32 and BPB_FSInfo == 1 */
      && LD_WORD(fs->win + BPB_FSInfo) == 1
      && move_window(fs, bsect + 1) == FR_OK)
    {
      fs->fsi_flag = 0;
      if (LD_WORD(fs->win + BS_55AA) == 0xAA55  /* Load FSINFO data if available */
          && LD_DWORD(fs->win + FSI_LeadSig) == 0x41615252
          && LD_DWORD(fs->win + FSI_StrucSig) == 0x61417272)
        {
#if (_FS_NOFSINFO & 1) == 0
          fs->free_clust = LD_DWORD(fs->win + FSI_Free_Count);
#endif
#if (_FS_NOFSINFO & 2) == 0
          fs->last_clust = LD_DWORD(fs->win + FSI_Nxt_Free);
#endif
        }
    }
#endif
#endif
  fs->fs_type = fmt;    /* FAT sub-type */
  fs->id = ++Fsid;  /* File system mount ID */
#if _FS_RPATH
  fs->cdir = 0;     /* Set current directory to root */
#endif
#if _FS_LOCK            /* Clear file lock semaphores */
  clear_lock(fs);
#endif

  return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/directory object is valid or not                    */
/*-----------------------------------------------------------------------*/

static
FRESULT validate (  /* FR_OK(0): The object is valid, !=0: Invalid */
                  void* obj     /* Pointer to the object FIL/DIR to check validity */
                    )
{
  FIL *fil = (FIL*)obj; /* Assuming offset of .fs and .id in the FIL/DIR structure is identical */


  if (!fil || !fil->fs || !fil->fs->fs_type || fil->fs->id != fil->id || (disk_status(fil->fs->drv) & STA_NOINIT))
    return FR_INVALID_OBJECT;

  ENTER_FF(fil->fs);        /* Lock file system */

  return FR_OK;
}




/*--------------------------------------------------------------------------

  Public Functions

  ---------------------------------------------------------------------------*/



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Logical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_mount (
                 FATFS* fs,         /* Pointer to the file system object (NULL:unmount)*/
                 const TCHAR* path, /* Logical drive number to be mounted/unmounted */
                 uint8_t opt           /* 0:Do not mount (delayed mount), 1:Mount immediately */
                 )
{
  FATFS *cfs;
  int vol;
  FRESULT res;
  const TCHAR *rp = path;


  vol = get_ldnumber(&rp);
  if (vol < 0) return FR_INVALID_DRIVE;
  cfs = FatFs[vol];                 /* Pointer to fs object */

  if (cfs) {
#if _FS_LOCK
    clear_lock(cfs);
#endif
#if _FS_REENTRANT                       /* Discard sync object of the current volume */
    if (!ff_del_syncobj(cfs->sobj)) return FR_INT_ERR;
#endif
    cfs->fs_type = 0;               /* Clear old fs object */
  }

  if (fs) {
    fs->fs_type = 0;                /* Clear new fs object */
#if _FS_REENTRANT                       /* Create sync object for the new volume */
    if (!ff_cre_syncobj((uint8_t)vol, &fs->sobj)) return FR_INT_ERR;
#endif
  }
  FatFs[vol] = fs;                  /* Register new fs object */

  if (!fs || opt != 1) return FR_OK;    /* Do not mount now, it will be mounted later */

  res = find_volume(&fs, &path, 0); /* Force mounted the volume */
  LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_open (
                FIL* fp,            /* Pointer to the blank file object */
                const TCHAR* path,  /* Pointer to the file name */
                uint8_t mode           /* Access mode and file open mode flags */
                )
{
  FRESULT res;
  DIR dj;
  uint8_t *dir;
  DEFINE_NAMEBUF;
#if !_FS_READONLY
  uint32_t dw, cl;
#endif


  if (!fp) return FR_INVALID_OBJECT;
  fp->fs = 0;           /* Clear file object */

  /* Get logical drive number */
#if !_FS_READONLY
  mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
  res = find_volume(&dj.fs, &path, (uint8_t)(mode & ~FA_READ));
#else
  mode &= FA_READ;
  res = find_volume(&dj.fs, &path, 0);
#endif
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);   /* Follow the file path */
    dir = dj.dir;
#if !_FS_READONLY   /* R/W configuration */
    if (res == FR_OK) {
      if (!dir) /* Default directory itself */
        res = FR_INVALID_NAME;
#if _FS_LOCK
      else
        res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
#endif
    }
    /* Create or Open a file */
    if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
      if (res != FR_OK) {                   /* No file, create new */
        if (res == FR_NO_FILE)          /* There is no file to open, create a new entry */
#if _FS_LOCK
          res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
        res = dir_register(&dj);
#endif
        mode |= FA_CREATE_ALWAYS;       /* File is created */
        dir = dj.dir;                   /* New entry */
      }
      else {                                /* Any object is already existing */
        if (dir[DIR_Attr] & (AM_RDO | AM_DIR)) {    /* Cannot overwrite it (R/O or DIR) */
          res = FR_DENIED;
        } else {
          if (mode & FA_CREATE_NEW) /* Cannot create as new file */
            res = FR_EXIST;
        }
      }
      if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {  /* Truncate it if overwrite mode */
        dw = GET_FATTIME();
        ST_DWORD(dir + DIR_CrtTime, dw);/* Set created time */
        ST_DWORD(dir + DIR_WrtTime, dw);/* Set modified time */
        dir[DIR_Attr] = 0;              /* Reset attribute */
        ST_DWORD(dir + DIR_FileSize, 0);/* Reset file size */
        cl = ld_clust(dj.fs, dir);      /* Get cluster chain */
        st_clust(dir, 0);               /* Reset cluster */
        dj.fs->wflag = 1;
        if (cl) {                       /* Remove the cluster chain if exist */
          dw = dj.fs->winsect;
          res = remove_chain(dj.fs, cl);
          if (res == FR_OK) {
            dj.fs->last_clust = cl - 1; /* Reuse the cluster hole */
            res = move_window(dj.fs, dw);
          }
        }
      }
    }
    else {  /* Open an existing file */
      if (res == FR_OK) {                   /* Following succeeded */
        if (dir[DIR_Attr] & AM_DIR) {   /* It is a directory */
          res = FR_NO_FILE;
        } else {
          if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
            res = FR_DENIED;
        }
      }
    }
    if (res == FR_OK) {
      if (mode & FA_CREATE_ALWAYS)      /* Set file change flag if created or overwritten */
        mode |= FA__WRITTEN;
      fp->dir_sect = dj.fs->winsect;        /* Pointer to the directory entry */
      fp->dir_ptr = dir;
#if _FS_LOCK
      fp->lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
      if (!fp->lockid) res = FR_INT_ERR;
#endif
    }

#else               /* R/O configuration */
    if (res == FR_OK) {                 /* Follow succeeded */
      dir = dj.dir;
      if (!dir) {                       /* Current directory itself */
        res = FR_INVALID_NAME;
      } else {
        if (dir[DIR_Attr] & AM_DIR) /* It is a directory */
          res = FR_NO_FILE;
      }
    }
#endif
    FREE_BUF();

    if (res == FR_OK) {
      fp->flag = mode;                  /* File access mode */
      fp->err = 0;                      /* Clear error flag */
      fp->sclust = ld_clust(dj.fs, dir);    /* File start cluster */
      fp->fsize = LD_DWORD(dir + DIR_FileSize); /* File size */
      fp->fptr = 0;                     /* File pointer */
      fp->dsect = 0;
#if _USE_FASTSEEK
      fp->cltbl = 0;                        /* Normal seek mode */
#endif
      fp->fs = dj.fs;                       /* Validate file object */
      fp->id = fp->fs->id;
    }
  }

  LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_read (
                FIL* fp,        /* Pointer to the file object */
                void* buff,     /* Pointer to data buffer */
                uint32_t btr,       /* Number of bytes to read */
                uint32_t* br        /* Pointer to number of bytes read */
                )
{
  FRESULT res;
  uint32_t clst, sect, remain;
  uint32_t rcnt, cc;
  uint8_t csect, *rbuff = (uint8_t*)buff;


  *br = 0;  /* Clear read byte counter */

  res = validate(fp);                           /* Check validity */
  if (res != FR_OK) LEAVE_FF(fp->fs, res);
  if (fp->err)                              /* Check error */
    LEAVE_FF(fp->fs, (FRESULT)fp->err);
  if (!(fp->flag & FA_READ))                    /* Check access mode */
    LEAVE_FF(fp->fs, FR_DENIED);
  remain = fp->fsize - fp->fptr;
  if (btr > remain) btr = (uint32_t)remain;     /* Truncate btr by remaining bytes */

  for ( ;  btr;                             /* Repeat until all data read */
        rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
    if ((fp->fptr % SS(fp->fs)) == 0) {     /* On the sector boundary? */
      csect = (uint8_t)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));  /* Sector offset in the cluster */
      if (!csect) {                     /* On the cluster boundary? */
        if (fp->fptr == 0) {            /* On the top of the file? */
          clst = fp->sclust;            /* Follow from the origin */
        } else {                        /* Middle or end of the file */
#if _USE_FASTSEEK
          if (fp->cltbl)
            clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
          else
#endif
            clst = get_fat(fp->fs, fp->clust);  /* Follow cluster chain on the FAT */
        }
        if (clst < 2) ABORT(fp->fs, FR_INT_ERR);
        if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
        fp->clust = clst;               /* Update current cluster */
      }
      sect = clust2sect(fp->fs, fp->clust); /* Get current sector */
      if (!sect) ABORT(fp->fs, FR_INT_ERR);
      sect += csect;
      cc = btr / SS(fp->fs);                /* When remaining bytes >= sector size, */
      if (cc) {                         /* Read maximum contiguous sectors directly */
        if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
          cc = fp->fs->csize - csect;
        if (disk_read(fp->fs->drv, rbuff, sect, cc) != RES_OK)
          ABORT(fp->fs, FR_DISK_ERR);
#if !_FS_READONLY && _FS_MINIMIZE <= 2          /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if _FS_TINY
        if (fp->fs->wflag && fp->fs->winsect - sect < cc)
          mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs));
#else
        if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
          mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
#endif
#endif
        rcnt = SS(fp->fs) * cc;         /* Number of bytes transferred */
        continue;
      }
#if !_FS_TINY
      if (fp->dsect != sect) {          /* Load data sector if not in cache */
#if !_FS_READONLY
        if (fp->flag & FA__DIRTY) {     /* Write-back dirty sector cache */
          if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
            ABORT(fp->fs, FR_DISK_ERR);
          fp->flag &= ~FA__DIRTY;
        }
#endif
        if (disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK) /* Fill sector cache */
          ABORT(fp->fs, FR_DISK_ERR);
      }
#endif
      fp->dsect = sect;
    }
    rcnt = SS(fp->fs) - ((uint32_t)fp->fptr % SS(fp->fs));  /* Get partial sector data from sector buffer */
    if (rcnt > btr) rcnt = btr;
#if _FS_TINY
    if (move_window(fp->fs, fp->dsect) != FR_OK)        /* Move sector window */
      ABORT(fp->fs, FR_DISK_ERR);
    mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#else
    mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#endif
  }

  LEAVE_FF(fp->fs, FR_OK);
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write (
                 FIL* fp,           /* Pointer to the file object */
                 const void *buff,  /* Pointer to the data to be written */
                 uint32_t btw,          /* Number of bytes to write */
                 uint32_t* bw           /* Pointer to number of bytes written */
                 )
{
  FRESULT res;
  uint32_t clst, sect;
  uint32_t wcnt, cc;
  const uint8_t *wbuff = (const uint8_t*)buff;
  uint8_t csect;


  *bw = 0;  /* Clear write byte counter */

  res = validate(fp);                       /* Check validity */
  if (res != FR_OK) LEAVE_FF(fp->fs, res);
  if (fp->err)                          /* Check error */
    LEAVE_FF(fp->fs, (FRESULT)fp->err);
  if (!(fp->flag & FA_WRITE))               /* Check access mode */
    LEAVE_FF(fp->fs, FR_DENIED);
  if (fp->fptr + btw < fp->fptr) btw = 0;   /* File size cannot reach 4GB */

  for ( ;  btw;                         /* Repeat until all data written */
        wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
    if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
      csect = (uint8_t)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));  /* Sector offset in the cluster */
      if (!csect) {                 /* On the cluster boundary? */
        if (fp->fptr == 0) {        /* On the top of the file? */
          clst = fp->sclust;        /* Follow from the origin */
          if (clst == 0)            /* When no cluster is allocated, */
            clst = create_chain(fp->fs, 0); /* Create a new cluster chain */
        } else {                    /* Middle or end of the file */
#if _USE_FASTSEEK
          if (fp->cltbl)
            clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
          else
#endif
            clst = create_chain(fp->fs, fp->clust); /* Follow or stretch cluster chain on the FAT */
        }
        if (clst == 0) break;       /* Could not allocate a new cluster (disk full) */
        if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
        if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
        fp->clust = clst;           /* Update current cluster */
        if (fp->sclust == 0) fp->sclust = clst; /* Set start cluster if the first write */
      }
#if _FS_TINY
      if (fp->fs->winsect == fp->dsect && sync_window(fp->fs))  /* Write-back sector cache */
        ABORT(fp->fs, FR_DISK_ERR);
#else
      if (fp->flag & FA__DIRTY) {       /* Write-back sector cache */
        if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
          ABORT(fp->fs, FR_DISK_ERR);
        fp->flag &= ~FA__DIRTY;
      }
#endif
      sect = clust2sect(fp->fs, fp->clust); /* Get current sector */
      if (!sect) ABORT(fp->fs, FR_INT_ERR);
      sect += csect;
      cc = btw / SS(fp->fs);            /* When remaining bytes >= sector size, */
      if (cc) {                     /* Write maximum contiguous sectors directly */
        if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
          cc = fp->fs->csize - csect;
        if (disk_write(fp->fs->drv, wbuff, sect, cc) != RES_OK)
          ABORT(fp->fs, FR_DISK_ERR);
#if _FS_MINIMIZE <= 2
#if _FS_TINY
        if (fp->fs->winsect - sect < cc) {  /* Refill sector cache if it gets invalidated by the direct write */
          mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
          fp->fs->wflag = 0;
        }
#else
        if (fp->dsect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
          mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
          fp->flag &= ~FA__DIRTY;
        }
#endif
#endif
        wcnt = SS(fp->fs) * cc;     /* Number of bytes transferred */
        continue;
      }
#if _FS_TINY
      if (fp->fptr >= fp->fsize) {  /* Avoid silly cache filling at growing edge */
        if (sync_window(fp->fs)) ABORT(fp->fs, FR_DISK_ERR);
        fp->fs->winsect = sect;
      }
#else
      if (fp->dsect != sect) {      /* Fill sector cache with file data */
        if (fp->fptr < fp->fsize &&
            disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
          ABORT(fp->fs, FR_DISK_ERR);
      }
#endif
      fp->dsect = sect;
    }
    wcnt = SS(fp->fs) - ((uint32_t)fp->fptr % SS(fp->fs));/* Put partial sector into file I/O buffer */
    if (wcnt > btw) wcnt = btw;
#if _FS_TINY
    if (move_window(fp->fs, fp->dsect) != FR_OK)    /* Move sector window */
      ABORT(fp->fs, FR_DISK_ERR);
    mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
    fp->fs->wflag = 1;
#else
    mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
    fp->flag |= FA__DIRTY;
#endif
  }

  if (fp->fptr > fp->fsize) fp->fsize = fp->fptr;   /* Update file size if needed */
  fp->flag |= FA__WRITTEN;                      /* Set file change flag */

  LEAVE_FF(fp->fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Synchronize the File                                                  */
/*-----------------------------------------------------------------------*/

FRESULT f_sync (
                FIL* fp     /* Pointer to the file object */
                )
{
  FRESULT res;
  uint32_t tm;
  uint8_t *dir;


  res = validate(fp);                   /* Check validity of the object */
  if (res == FR_OK) {
    if (fp->flag & FA__WRITTEN) {   /* Is there any change to the file? */
#if !_FS_TINY
      if (fp->flag & FA__DIRTY) {   /* Write-back cached data if needed */
        if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
          LEAVE_FF(fp->fs, FR_DISK_ERR);
        fp->flag &= ~FA__DIRTY;
      }
#endif
      /* Update the directory entry */
      res = move_window(fp->fs, fp->dir_sect);
      if (res == FR_OK) {
        dir = fp->dir_ptr;
        dir[DIR_Attr] |= AM_ARC;                    /* Set archive bit */
        ST_DWORD(dir + DIR_FileSize, fp->fsize);    /* Update file size */
        st_clust(dir, fp->sclust);                  /* Update start cluster */
        tm = GET_FATTIME();                         /* Update modified time */
        ST_DWORD(dir + DIR_WrtTime, tm);
        ST_WORD(dir + DIR_LstAccDate, 0);
        fp->flag &= ~FA__WRITTEN;
        fp->fs->wflag = 1;
        res = sync_fs(fp->fs);
      }
    }
  }

  LEAVE_FF(fp->fs, res);
}

#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close (
                 FIL *fp        /* Pointer to the file object to be closed */
                 )
{
  FRESULT res;


#if !_FS_READONLY
  res = f_sync(fp);                 /* Flush cached data */
  if (res == FR_OK)
#endif
    {
      res = validate(fp);               /* Lock volume */
      if (res == FR_OK) {
#if _FS_REENTRANT
        FATFS *fs = fp->fs;
#endif
#if _FS_LOCK
        res = dec_lock(fp->lockid); /* Decrement file open counter */
        if (res == FR_OK)
#endif
          fp->fs = 0;               /* Invalidate file object */
#if _FS_REENTRANT
        unlock_fs(fs, FR_OK);       /* Unlock volume */
#endif
      }
    }
  return res;
}




/*-----------------------------------------------------------------------*/
/* Change Current Directory or Current Drive, Get Current Directory      */
/*-----------------------------------------------------------------------*/

#if _FS_RPATH >= 1
#if _VOLUMES >= 2
FRESULT f_chdrive (
                   const TCHAR* path        /* Drive number */
                   )
{
  int vol;


  vol = get_ldnumber(&path);
  if (vol < 0) return FR_INVALID_DRIVE;

  CurrVol = (uint8_t)vol;

  return FR_OK;
}
#endif


FRESULT f_chdir (
                 const TCHAR* path  /* Pointer to the directory path */
                 )
{
  FRESULT res;
  DIR dj;
  DEFINE_NAMEBUF;


  /* Get logical drive number */
  res = find_volume(&dj.fs, &path, 0);
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);       /* Follow the path */
    FREE_BUF();
    if (res == FR_OK) {                 /* Follow completed */
      if (!dj.dir) {
        dj.fs->cdir = dj.sclust;    /* Start directory itself */
      } else {
        if (dj.dir[DIR_Attr] & AM_DIR)  /* Reached to the directory */
          dj.fs->cdir = ld_clust(dj.fs, dj.dir);
        else
          res = FR_NO_PATH;     /* Reached but a file */
      }
    }
    if (res == FR_NO_FILE) res = FR_NO_PATH;
  }

  LEAVE_FF(dj.fs, res);
}


#if _FS_RPATH >= 2
FRESULT f_getcwd (
                  TCHAR* buff,  /* Pointer to the directory path */
                  uint32_t len      /* Size of path */
                  )
{
  FRESULT res;
  DIR dj;
  uint32_t i, n;
  uint32_t ccl;
  TCHAR *tp;
  FILINFO fno;
  DEFINE_NAMEBUF;


  *buff = 0;
  /* Get logical drive number */
  res = find_volume(&dj.fs, (const TCHAR**)&buff, 0);   /* Get current volume */
  if (res == FR_OK) {
    INIT_BUF(dj);
    i = len;            /* Bottom of buffer (directory stack base) */
    dj.sclust = dj.fs->cdir;            /* Start to follow upper directory from current directory */
    while ((ccl = dj.sclust) != 0) {    /* Repeat while current directory is a sub-directory */
      res = dir_sdi(&dj, 1);            /* Get parent directory */
      if (res != FR_OK) break;
      res = dir_read(&dj, 0);
      if (res != FR_OK) break;
      dj.sclust = ld_clust(dj.fs, dj.dir);  /* Goto parent directory */
      res = dir_sdi(&dj, 0);
      if (res != FR_OK) break;
      do {                          /* Find the entry links to the child directory */
        res = dir_read(&dj, 0);
        if (res != FR_OK) break;
        if (ccl == ld_clust(dj.fs, dj.dir)) break;  /* Found the entry */
        res = dir_next(&dj, 0); 
      } while (res == FR_OK);
      if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
      if (res != FR_OK) break;
#if _USE_LFN
      fno.lfname = buff;
      fno.lfsize = i;
#endif
      get_fileinfo(&dj, &fno);      /* Get the directory name and push it to the buffer */
      tp = fno.fname;
#if _USE_LFN
      if (*buff) tp = buff;
#endif
      for (n = 0; tp[n]; n++) ;
      if (i < n + 3) {
        res = FR_NOT_ENOUGH_CORE; break;
      }
      while (n) buff[--i] = tp[--n];
      buff[--i] = '/';
    }
    tp = buff;
    if (res == FR_OK) {
#if _VOLUMES >= 2
      *tp++ = '0' + CurrVol;            /* Put drive number */
      *tp++ = ':';
#endif
      if (i == len) {                   /* Root-directory */
        *tp++ = '/';
      } else {                      /* Sub-directroy */
        do      /* Add stacked path str */
          *tp++ = buff[i++];
        while (i < len);
      }
    }
    *tp = 0;
    FREE_BUF();
  }

  LEAVE_FF(dj.fs, res);
}
#endif /* _FS_RPATH >= 2 */
#endif /* _FS_RPATH >= 1 */



#if _FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File R/W Pointer                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek (
                 FIL* fp,       /* Pointer to the file object */
                 uint32_t ofs      /* File pointer from top of file */
                 )
{
  FRESULT res;
  uint32_t clst, bcs, nsect, ifptr;
#if _USE_FASTSEEK
  uint32_t cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;
#endif


  res = validate(fp);                   /* Check validity of the object */
  if (res != FR_OK) LEAVE_FF(fp->fs, res);
  if (fp->err)                      /* Check error */
    LEAVE_FF(fp->fs, (FRESULT)fp->err);

#if _USE_FASTSEEK
  if (fp->cltbl) {  /* Fast seek */
    if (ofs == CREATE_LINKMAP) {    /* Create CLMT */
      tbl = fp->cltbl;
      tlen = *tbl++; ulen = 2;  /* Given table size and required table size */
      cl = fp->sclust;          /* Top of the chain */
      if (cl) {
        do {
          /* Get a fragment */
          tcl = cl; ncl = 0; ulen += 2; /* Top, length and used items */
          do {
            pcl = cl; ncl++;
            cl = get_fat(fp->fs, cl);
            if (cl <= 1) ABORT(fp->fs, FR_INT_ERR);
            if (cl == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
          } while (cl == pcl + 1);
          if (ulen <= tlen) {       /* Store the length and top of the fragment */
            *tbl++ = ncl; *tbl++ = tcl;
          }
        } while (cl < fp->fs->n_fatent);    /* Repeat until end of chain */
      }
      *fp->cltbl = ulen;    /* Number of items used */
      if (ulen <= tlen)
        *tbl = 0;       /* Terminate table */
      else
        res = FR_NOT_ENOUGH_CORE;   /* Given table size is smaller than required */

    } else {                        /* Fast seek */
      if (ofs > fp->fsize)      /* Clip offset at the file size */
        ofs = fp->fsize;
      fp->fptr = ofs;               /* Set file pointer */
      if (ofs) {
        fp->clust = clmt_clust(fp, ofs - 1);
        dsc = clust2sect(fp->fs, fp->clust);
        if (!dsc) ABORT(fp->fs, FR_INT_ERR);
        dsc += (ofs - 1) / SS(fp->fs) & (fp->fs->csize - 1);
        if (fp->fptr % SS(fp->fs) && dsc != fp->dsect) {    /* Refill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
          if (fp->flag & FA__DIRTY) {       /* Write-back dirty sector cache */
            if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
              ABORT(fp->fs, FR_DISK_ERR);
            fp->flag &= ~FA__DIRTY;
          }
#endif
          if (disk_read(fp->fs->drv, fp->buf, dsc, 1) != RES_OK)    /* Load current sector */
            ABORT(fp->fs, FR_DISK_ERR);
#endif
          fp->dsect = dsc;
        }
      }
    }
  } else
#endif

    /* Normal Seek */
    {
      if (ofs > fp->fsize                   /* In read-only mode, clip offset with the file size */
#if !_FS_READONLY
          && !(fp->flag & FA_WRITE)
#endif
          ) ofs = fp->fsize;

      ifptr = fp->fptr;
      fp->fptr = nsect = 0;
      if (ofs) {
        bcs = (uint32_t)fp->fs->csize * SS(fp->fs);    /* Cluster size (byte) */
        if (ifptr > 0 &&
            (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
          fp->fptr = (ifptr - 1) & ~(bcs - 1);  /* start from the current cluster */
          ofs -= fp->fptr;
          clst = fp->clust;
        } else {                                    /* When seek to back cluster, */
          clst = fp->sclust;                        /* start from the first cluster */
#if !_FS_READONLY
          if (clst == 0) {                      /* If no cluster chain, create a new chain */
            clst = create_chain(fp->fs, 0);
            if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
            if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
            fp->sclust = clst;
          }
#endif
          fp->clust = clst;
        }
        if (clst != 0) {
          while (ofs > bcs) {                       /* Cluster following loop */
#if !_FS_READONLY
            if (fp->flag & FA_WRITE) {          /* Check if in write mode or not */
              clst = create_chain(fp->fs, clst);    /* Force stretch if in write mode */
              if (clst == 0) {              /* When disk gets full, clip file size */
                ofs = bcs; break;
              }
            } else
#endif
              clst = get_fat(fp->fs, clst); /* Follow cluster chain if not in write mode */
            if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
            if (clst <= 1 || clst >= fp->fs->n_fatent) ABORT(fp->fs, FR_INT_ERR);
            fp->clust = clst;
            fp->fptr += bcs;
            ofs -= bcs;
          }
          fp->fptr += ofs;
          if (ofs % SS(fp->fs)) {
            nsect = clust2sect(fp->fs, clst);   /* Current sector */
            if (!nsect) ABORT(fp->fs, FR_INT_ERR);
            nsect += ofs / SS(fp->fs);
          }
        }
      }
      if (fp->fptr % SS(fp->fs) && nsect != fp->dsect) {    /* Fill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
        if (fp->flag & FA__DIRTY) {         /* Write-back dirty sector cache */
          if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
            ABORT(fp->fs, FR_DISK_ERR);
          fp->flag &= ~FA__DIRTY;
        }
#endif
        if (disk_read(fp->fs->drv, fp->buf, nsect, 1) != RES_OK)    /* Fill sector cache */
          ABORT(fp->fs, FR_DISK_ERR);
#endif
        fp->dsect = nsect;
      }
#if !_FS_READONLY
      if (fp->fptr > fp->fsize) {           /* Set file change flag if the file size is extended */
        fp->fsize = fp->fptr;
        fp->flag |= FA__WRITTEN;
      }
#endif
    }

  LEAVE_FF(fp->fs, res);
}



#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Create a Directory Object                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir (
                   DIR* dp,         /* Pointer to directory object to create */
                   const TCHAR* path    /* Pointer to the directory path */
                   )
{
  FRESULT res;
  FATFS* fs;
  DEFINE_NAMEBUF;


  if (!dp) return FR_INVALID_OBJECT;

  /* Get logical drive number */
  res = find_volume(&fs, &path, 0);
  if (res == FR_OK) {
    dp->fs = fs;
    INIT_BUF(*dp);
    res = follow_path(dp, path);            /* Follow the path to the directory */
    FREE_BUF();
    if (res == FR_OK) {                     /* Follow completed */
      if (dp->dir) {                        /* It is not the origin directory itself */
        if (dp->dir[DIR_Attr] & AM_DIR) /* The object is a sub directory */
          dp->sclust = ld_clust(fs, dp->dir);
        else                            /* The object is a file */
          res = FR_NO_PATH;
      }
      if (res == FR_OK) {
        dp->id = fs->id;
        res = dir_sdi(dp, 0);           /* Rewind directory */
#if _FS_LOCK
        if (res == FR_OK) {
          if (dp->sclust) {
            dp->lockid = inc_lock(dp, 0);   /* Lock the sub directory */
            if (!dp->lockid)
              res = FR_TOO_MANY_OPEN_FILES;
          } else {
            dp->lockid = 0; /* Root directory need not to be locked */
          }
        }
#endif
      }
    }
    if (res == FR_NO_FILE) res = FR_NO_PATH;
  }
  if (res != FR_OK) dp->fs = 0;     /* Invalidate the directory object if function faild */

  LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Close Directory                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_closedir (
                    DIR *dp     /* Pointer to the directory object to be closed */
                    )
{
  FRESULT res;


  res = validate(dp);
  if (res == FR_OK) {
#if _FS_REENTRANT
    FATFS *fs = dp->fs;
#endif
#if _FS_LOCK
    if (dp->lockid)             /* Decrement sub-directory open counter */
      res = dec_lock(dp->lockid);
    if (res == FR_OK)
#endif
      dp->fs = 0;               /* Invalidate directory object */
#if _FS_REENTRANT
    unlock_fs(fs, FR_OK);       /* Unlock volume */
#endif
  }
  return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entries in Sequence                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir (
                   DIR* dp,         /* Pointer to the open directory object */
                   FILINFO* fno     /* Pointer to file information to return */
                   )
{
  FRESULT res;
  DEFINE_NAMEBUF;


  res = validate(dp);                       /* Check validity of the object */
  if (res == FR_OK) {
    if (!fno) {
      res = dir_sdi(dp, 0);         /* Rewind the directory object */
    } else {
      INIT_BUF(*dp);
      res = dir_read(dp, 0);            /* Read an item */
      if (res == FR_NO_FILE) {      /* Reached end of directory */
        dp->sect = 0;
        res = FR_OK;
      }
      if (res == FR_OK) {               /* A valid entry is found */
        get_fileinfo(dp, fno);      /* Get the object information */
        res = dir_next(dp, 0);      /* Increment index for next */
        if (res == FR_NO_FILE) {
          dp->sect = 0;
          res = FR_OK;
        }
      }
      FREE_BUF();
    }
  }

  LEAVE_FF(dp->fs, res);
}



#if _USE_FIND
/*-----------------------------------------------------------------------*/
/* Find next file                                                        */
/*-----------------------------------------------------------------------*/

FRESULT f_findnext (
                    DIR* dp,        /* Pointer to the open directory object */
                    FILINFO* fno    /* Pointer to the file information structure */
                    )
{
  FRESULT res;


  for (;;) {
    res = f_readdir(dp, fno);       /* Get a directory item */
    if (res != FR_OK || !fno || !fno->fname[0]) break;  /* Terminate if any error or end of directory */
#if _USE_LFN
    if (fno->lfname && pattern_matching(dp->pat, fno->lfname, 0, 0)) break; /* Test for LFN if exist */
#endif
    if (pattern_matching(dp->pat, fno->fname, 0, 0)) break; /* Test for SFN */
  }
  return res;

}



/*-----------------------------------------------------------------------*/
/* Find first file                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_findfirst (
                     DIR* dp,               /* Pointer to the blank directory object */
                     FILINFO* fno,          /* Pointer to the file information structure */
                     const TCHAR* path,     /* Pointer to the directory to open */
                     const TCHAR* pattern   /* Pointer to the matching pattern */
                     )
{
  FRESULT res;


  dp->pat = pattern;        /* Save pointer to pattern string */
  res = f_opendir(dp, path);        /* Open the target directory */
  if (res == FR_OK)
    res = f_findnext(dp, fno);  /* Find the first item */
  return res;
}

#endif  /* _USE_FIND */



#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat (
                const TCHAR* path,  /* Pointer to the file path */
                FILINFO* fno        /* Pointer to file information to return */
                )
{
  FRESULT res;
  DIR dj;
  DEFINE_NAMEBUF;


  /* Get logical drive number */
  res = find_volume(&dj.fs, &path, 0);
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);   /* Follow the file path */
    if (res == FR_OK) {             /* Follow completed */
      if (dj.dir) {     /* Found an object */
        if (fno) get_fileinfo(&dj, fno);
      } else {          /* It is root directory */
        res = FR_INVALID_NAME;
      }
    }
    FREE_BUF();
  }

  LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree (
                   const TCHAR* path,   /* Path name of the logical drive number */
                   uint32_t* nclst,        /* Pointer to a variable to return number of free clusters */
                   FATFS** fatfs        /* Pointer to return pointer to corresponding file system object */
                   )
{
  FRESULT res;
  FATFS *fs;
  uint32_t nfree, clst, sect, stat;
  uint32_t i;
  uint8_t fat, *p;


  /* Get logical drive number */
  res = find_volume(fatfs, &path, 0);
  fs = *fatfs;
  if (res == FR_OK) {
    /* If free_clust is valid, return it without full cluster scan */
    if (fs->free_clust <= fs->n_fatent - 2) {
      *nclst = fs->free_clust;
    } else {
      /* Get number of free clusters */
      fat = fs->fs_type;
      nfree = 0;
      if (fat == FS_FAT12) {    /* Sector unalighed entries: Search FAT via regular routine. */
        clst = 2;
        do {
          stat = get_fat(fs, clst);
          if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
          if (stat == 1) { res = FR_INT_ERR; break; }
          if (stat == 0) nfree++;
        } while (++clst < fs->n_fatent);
      } else {              /* Sector alighed entries: Accelerate the FAT search. */
        clst = fs->n_fatent; sect = fs->fatbase;
        i = 0; p = 0;
        do {
          if (!i) {
            res = move_window(fs, sect++);
            if (res != FR_OK) break;
            p = fs->win;
            i = SS(fs);
          }
          if (fat == FS_FAT16) {
            if (LD_WORD(p) == 0) nfree++;
            p += 2; i -= 2;
          } else {
            if ((LD_DWORD(p) & 0x0FFFFFFF) == 0) nfree++;
            p += 4; i -= 4;
          }
        } while (--clst);
      }
      fs->free_clust = nfree;   /* free_clust is valid */
      fs->fsi_flag |= 1;        /* FSInfo is to be updated */
      *nclst = nfree;           /* Return the free clusters */
    }
  }
  LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Truncate File                                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_truncate (
                    FIL* fp     /* Pointer to the file object */
                    )
{
  FRESULT res;
  uint32_t ncl;


  res = validate(fp);                       /* Check validity of the object */
  if (res == FR_OK) {
    if (fp->err) {                      /* Check error */
      res = (FRESULT)fp->err;
    } else {
      if (!(fp->flag & FA_WRITE))       /* Check access mode */
        res = FR_DENIED;
    }
  }
  if (res == FR_OK) {
    if (fp->fsize > fp->fptr) {
      fp->fsize = fp->fptr; /* Set file size to current R/W point */
      fp->flag |= FA__WRITTEN;
      if (fp->fptr == 0) {  /* When set file size to zero, remove entire cluster chain */
        res = remove_chain(fp->fs, fp->sclust);
        fp->sclust = 0;
      } else {              /* When truncate a part of the file, remove remaining clusters */
        ncl = get_fat(fp->fs, fp->clust);
        res = FR_OK;
        if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
        if (ncl == 1) res = FR_INT_ERR;
        if (res == FR_OK && ncl < fp->fs->n_fatent) {
          res = put_fat(fp->fs, fp->clust, 0x0FFFFFFF);
          if (res == FR_OK) res = remove_chain(fp->fs, ncl);
        }
      }
#if !_FS_TINY
      if (res == FR_OK && (fp->flag & FA__DIRTY)) {
        if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
          res = FR_DISK_ERR;
        else
          fp->flag &= ~FA__DIRTY;
      }
#endif
    }
    if (res != FR_OK) fp->err = (FRESULT)res;
  }

  LEAVE_FF(fp->fs, res);
}




/*-----------------------------------------------------------------------*/
/* Delete a File or Directory                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink (
                  const TCHAR* path     /* Pointer to the file or directory path */
                  )
{
  FRESULT res;
  DIR dj, sdj;
  uint8_t *dir;
  uint32_t dclst = 0;
  DEFINE_NAMEBUF;


  /* Get logical drive number */
  res = find_volume(&dj.fs, &path, 1);
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);       /* Follow the file path */
    if (_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT))
      res = FR_INVALID_NAME;            /* Cannot remove dot entry */
#if _FS_LOCK
    if (res == FR_OK) res = chk_lock(&dj, 2);   /* Cannot remove open object */
#endif
    if (res == FR_OK) {                 /* The object is accessible */
      dir = dj.dir;
      if (!dir) {
        res = FR_INVALID_NAME;      /* Cannot remove the origin directory */
      } else {
        if (dir[DIR_Attr] & AM_RDO)
          res = FR_DENIED;      /* Cannot remove R/O object */
      }
      if (res == FR_OK) {
        dclst = ld_clust(dj.fs, dir);
        if (dclst && (dir[DIR_Attr] & AM_DIR)) {    /* Is it a sub-directory ? */
#if _FS_RPATH
          if (dclst == dj.fs->cdir) {               /* Is it the current directory? */
            res = FR_DENIED;
          } else
#endif
            {
              mem_cpy(&sdj, &dj, sizeof (DIR)); /* Open the sub-directory */
              sdj.sclust = dclst;
              res = dir_sdi(&sdj, 2);
              if (res == FR_OK) {
                res = dir_read(&sdj, 0);            /* Read an item (excluding dot entries) */
                if (res == FR_OK) res = FR_DENIED;  /* Not empty? (cannot remove) */
                if (res == FR_NO_FILE) res = FR_OK; /* Empty? (can remove) */
              }
            }
        }
      }
      if (res == FR_OK) {
        res = dir_remove(&dj);      /* Remove the directory entry */
        if (res == FR_OK && dclst)  /* Remove the cluster chain if exist */
          res = remove_chain(dj.fs, dclst);
        if (res == FR_OK) res = sync_fs(dj.fs);
      }
    }
    FREE_BUF();
  }

  LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir (
                 const TCHAR* path      /* Pointer to the directory path */
                 )
{
  FRESULT res;
  DIR dj;
  uint8_t *dir, n;
  uint32_t dsc, dcl, pcl, tm = GET_FATTIME();
  DEFINE_NAMEBUF;


  /* Get logical drive number */
  res = find_volume(&dj.fs, &path, 1);
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);           /* Follow the file path */
    if (res == FR_OK) res = FR_EXIST;       /* Any object with same name is already existing */
    if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT))
      res = FR_INVALID_NAME;
    if (res == FR_NO_FILE) {                /* Can create a new directory */
      dcl = create_chain(dj.fs, 0);     /* Allocate a cluster for the new directory table */
      res = FR_OK;
      if (dcl == 0) res = FR_DENIED;        /* No space to allocate a new cluster */
      if (dcl == 1) res = FR_INT_ERR;
      if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;
      if (res == FR_OK)                 /* Flush FAT */
        res = sync_window(dj.fs);
      if (res == FR_OK) {                   /* Initialize the new directory table */
        dsc = clust2sect(dj.fs, dcl);
        dir = dj.fs->win;
        mem_set(dir, 0, SS(dj.fs));
        mem_set(dir + DIR_Name, ' ', 11);   /* Create "." entry */
        dir[DIR_Name] = '.';
        dir[DIR_Attr] = AM_DIR;
        ST_DWORD(dir + DIR_WrtTime, tm);
        st_clust(dir, dcl);
        mem_cpy(dir + SZ_DIRE, dir, SZ_DIRE);   /* Create ".." entry */
        dir[SZ_DIRE + 1] = '.'; pcl = dj.sclust;
        if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
          pcl = 0;
        st_clust(dir + SZ_DIRE, pcl);
        for (n = dj.fs->csize; n; n--) {    /* Write dot entries and clear following sectors */
          dj.fs->winsect = dsc++;
          dj.fs->wflag = 1;
          res = sync_window(dj.fs);
          if (res != FR_OK) break;
          mem_set(dir, 0, SS(dj.fs));
        }
      }
      if (res == FR_OK) res = dir_register(&dj);    /* Register the object to the directoy */
      if (res != FR_OK) {
        remove_chain(dj.fs, dcl);           /* Could not register, remove cluster chain */
      } else {
        dir = dj.dir;
        dir[DIR_Attr] = AM_DIR;             /* Attribute */
        ST_DWORD(dir + DIR_WrtTime, tm);    /* Created time */
        st_clust(dir, dcl);                 /* Table start cluster */
        dj.fs->wflag = 1;
        res = sync_fs(dj.fs);
      }
    }
    FREE_BUF();
  }

  LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod (
                 const TCHAR* path, /* Pointer to the file path */
                 uint8_t attr,         /* Attribute bits */
                 uint8_t mask          /* Attribute mask to change */
                 )
{
  FRESULT res;
  DIR dj;
  uint8_t *dir;
  DEFINE_NAMEBUF;


  res = find_volume(&dj.fs, &path, 1);  /* Get logical drive number */
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);       /* Follow the file path */
    FREE_BUF();
    if (_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT))
      res = FR_INVALID_NAME;
    if (res == FR_OK) {
      dir = dj.dir;
      if (!dir) {                       /* Is it a root directory? */
        res = FR_INVALID_NAME;
      } else {                      /* File or sub directory */
        mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;    /* Valid attribute mask */
        dir[DIR_Attr] = (attr & mask) | (dir[DIR_Attr] & (uint8_t)~mask);  /* Apply attribute change */
        dj.fs->wflag = 1;
        res = sync_fs(dj.fs);
      }
    }
  }

  LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Rename File/Directory                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_rename (
                  const TCHAR* path_old,    /* Pointer to the object to be renamed */
                  const TCHAR* path_new /* Pointer to the new name */
                  )
{
  FRESULT res;
  DIR djo, djn;
  uint8_t buf[21], *dir;
  uint32_t dw;
  DEFINE_NAMEBUF;


  /* Get logical drive number of the source object */
  res = find_volume(&djo.fs, &path_old, 1);
  if (res == FR_OK) {
    djn.fs = djo.fs;
    INIT_BUF(djo);
    res = follow_path(&djo, path_old);      /* Check old object */
    if (_FS_RPATH && res == FR_OK && (djo.fn[NSFLAG] & NS_DOT))
      res = FR_INVALID_NAME;
#if _FS_LOCK
    if (res == FR_OK) res = chk_lock(&djo, 2);
#endif
    if (res == FR_OK) {                     /* Old object is found */
      if (!djo.dir) {                       /* Is root dir? */
        res = FR_NO_FILE;
      } else {
        mem_cpy(buf, djo.dir + DIR_Attr, 21);   /* Save information about object except name */
        mem_cpy(&djn, &djo, sizeof (DIR));      /* Duplicate the directory object */
        if (get_ldnumber(&path_new) >= 0)       /* Snip drive number off and ignore it */
          res = follow_path(&djn, path_new);    /* and make sure if new object name is not conflicting */
        else
          res = FR_INVALID_DRIVE;
        if (res == FR_OK) res = FR_EXIST;       /* The new object name is already existing */
        if (res == FR_NO_FILE) {                /* It is a valid path and no name collision */
          res = dir_register(&djn);         /* Register the new entry */
          if (res == FR_OK) {
            /* Start of critical section where any interruption can cause a cross-link */
            dir = djn.dir;                  /* Copy information about object except name */
            mem_cpy(dir + 13, buf + 2, 19);
            dir[DIR_Attr] = buf[0] | AM_ARC;
            djo.fs->wflag = 1;
            if ((dir[DIR_Attr] & AM_DIR) && djo.sclust != djn.sclust) { /* Update .. entry in the sub-directory if needed */
              dw = clust2sect(djo.fs, ld_clust(djo.fs, dir));
              if (!dw) {
                res = FR_INT_ERR;
              } else {
                res = move_window(djo.fs, dw);
                dir = djo.fs->win + SZ_DIRE * 1;    /* Ptr to .. entry */
                if (res == FR_OK && dir[1] == '.') {
                  st_clust(dir, djn.sclust);
                  djo.fs->wflag = 1;
                }
              }
            }
            if (res == FR_OK) {
              res = dir_remove(&djo);       /* Remove old entry */
              if (res == FR_OK)
                res = sync_fs(djo.fs);
            }
            /* End of critical section */
          }
        }
      }
    }
    FREE_BUF();
  }

  LEAVE_FF(djo.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Timestamp                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_utime (
                 const TCHAR* path, /* Pointer to the file/directory name */
                 const FILINFO* fno /* Pointer to the time stamp to be set */
                 )
{
  FRESULT res;
  DIR dj;
  uint8_t *dir;
  DEFINE_NAMEBUF;


  /* Get logical drive number */
  res = find_volume(&dj.fs, &path, 1);
  if (res == FR_OK) {
    INIT_BUF(dj);
    res = follow_path(&dj, path);   /* Follow the file path */
    FREE_BUF();
    if (_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT))
      res = FR_INVALID_NAME;
    if (res == FR_OK) {
      dir = dj.dir;
      if (!dir) {                   /* Root directory */
        res = FR_INVALID_NAME;
      } else {                  /* File or sub-directory */
        ST_WORD(dir + DIR_WrtTime, fno->ftime);
        ST_WORD(dir + DIR_WrtDate, fno->fdate);
        dj.fs->wflag = 1;
        res = sync_fs(dj.fs);
      }
    }
  }

  LEAVE_FF(dj.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _FS_MINIMIZE == 0 */
#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */




#if _USE_LABEL
/*-----------------------------------------------------------------------*/
/* Get volume label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_getlabel (
                    const TCHAR* path,  /* Path name of the logical drive number */
                    TCHAR* label,       /* Pointer to a buffer to return the volume label */
                    uint32_t* vsn          /* Pointer to a variable to return the volume serial number */
                    )
{
  FRESULT res;
  DIR dj;
  uint32_t i, j;
#if _USE_LFN && _LFN_UNICODE
  uint16_t w;
#endif


  /* Get logical drive number */
  res = find_volume(&dj.fs, &path, 0);

  /* Get volume label */
  if (res == FR_OK && label) {
    dj.sclust = 0;                  /* Open root directory */
    res = dir_sdi(&dj, 0);
    if (res == FR_OK) {
      res = dir_read(&dj, 1);       /* Get an entry with AM_VOL */
      if (res == FR_OK) {           /* A volume label is exist */
#if _USE_LFN && _LFN_UNICODE
        i = j = 0;
        do {
          w = (i < 11) ? dj.dir[i++] : ' ';
          if (IsDBCS1(w) && i < 11 && IsDBCS2(dj.dir[i]))
            w = w << 8 | dj.dir[i++];
          label[j++] = ff_convert(w, 1);    /* OEM -> Unicode */
        } while (j < 11);
#else
        mem_cpy(label, dj.dir, 11);
#endif
        j = 11;
        do {
          label[j] = 0;
          if (!j) break;
        } while (label[--j] == ' ');
      }
      if (res == FR_NO_FILE) {  /* No label, return nul string */
        label[0] = 0;
        res = FR_OK;
      }
    }
  }

  /* Get volume serial number */
  if (res == FR_OK && vsn) {
    res = move_window(dj.fs, dj.fs->volbase);
    if (res == FR_OK) {
      i = dj.fs->fs_type == FS_FAT32 ? BS_VolID32 : BS_VolID;
      *vsn = LD_DWORD(&dj.fs->win[i]);
    }
  }

  LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Set volume label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel (
                    const TCHAR* label  /* Pointer to the volume label to set */
                    )
{
  FRESULT res;
  DIR dj;
  uint8_t vn[11];
  uint32_t i, j, sl;
  uint16_t w;
  uint32_t tm;


  /* Get logical drive number */
  res = find_volume(&dj.fs, &label, 1);
  if (res) LEAVE_FF(dj.fs, res);

  /* Create a volume label in directory form */
  vn[0] = 0;
  for (sl = 0; label[sl]; sl++) ;               /* Get name length */
  for ( ; sl && label[sl - 1] == ' '; sl--) ;   /* Remove trailing spaces */
  if (sl) { /* Create volume label in directory form */
    i = j = 0;
    do {
#if _USE_LFN && _LFN_UNICODE
      w = ff_convert(ff_wtoupper(label[i++]), 0);
#else
      w = (uint8_t)label[i++];
      if (IsDBCS1(w))
        w = (j < 10 && i < sl && IsDBCS2(label[i])) ? w << 8 | (uint8_t)label[i++] : 0;
#if _USE_LFN
      w = ff_convert(ff_wtoupper(ff_convert(w, 1)), 0);
#else
      if (IsLower(w)) w -= 0x20;            /* To upper ASCII characters */
#ifdef _EXCVT
      if (w >= 0x80) w = ExCvt[w - 0x80];   /* To upper extended characters (SBCS cfg) */
#else
      if (!_DF1S && w >= 0x80) w = 0;       /* Reject extended characters (ASCII cfg) */
#endif
#endif
#endif
      if (!w || chk_chr("\"*+,.:;<=>\?[]|\x7F", w) || j >= (uint32_t)((w >= 0x100) ? 10 : 11)) /* Reject invalid characters for volume label */
        LEAVE_FF(dj.fs, FR_INVALID_NAME);
      if (w >= 0x100) vn[j++] = (uint8_t)(w >> 8);
      vn[j++] = (uint8_t)w;
    } while (i < sl);
    while (j < 11) vn[j++] = ' ';   /* Fill remaining name field */
    if (vn[0] == DDEM) LEAVE_FF(dj.fs, FR_INVALID_NAME);    /* Reject illegal name (heading DDEM) */
  }

  /* Set volume label */
  dj.sclust = 0;                    /* Open root directory */
  res = dir_sdi(&dj, 0);
  if (res == FR_OK) {
    res = dir_read(&dj, 1);     /* Get an entry with AM_VOL */
    if (res == FR_OK) {         /* A volume label is found */
      if (vn[0]) {
        mem_cpy(dj.dir, vn, 11);    /* Change the volume label name */
        tm = GET_FATTIME();
        ST_DWORD(dj.dir + DIR_WrtTime, tm);
      } else {
        dj.dir[0] = DDEM;           /* Remove the volume label */
      }
      dj.fs->wflag = 1;
      res = sync_fs(dj.fs);
    } else {                    /* No volume label is found or error */
      if (res == FR_NO_FILE) {
        res = FR_OK;
        if (vn[0]) {                /* Create volume label as new */
          res = dir_alloc(&dj, 1);  /* Allocate an entry for volume label */
          if (res == FR_OK) {
            mem_set(dj.dir, 0, SZ_DIRE);    /* Set volume label */
            mem_cpy(dj.dir, vn, 11);
            dj.dir[DIR_Attr] = AM_VOL;
            tm = GET_FATTIME();
            ST_DWORD(dj.dir + DIR_WrtTime, tm);
            dj.fs->wflag = 1;
            res = sync_fs(dj.fs);
          }
        }
      }
    }
  }

  LEAVE_FF(dj.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _USE_LABEL */



/*-----------------------------------------------------------------------*/
/* Forward data to the stream directly (available on only tiny cfg)      */
/*-----------------------------------------------------------------------*/
#if _USE_FORWARD && _FS_TINY

FRESULT f_forward (
                   FIL* fp,                         /* Pointer to the file object */
                   uint32_t (*func)(const uint8_t*,uint32_t),  /* Pointer to the streaming function */
                   uint32_t btf,                        /* Number of bytes to forward */
                   uint32_t* bf                     /* Pointer to number of bytes forwarded */
                   )
{
  FRESULT res;
  uint32_t remain, clst, sect;
  uint32_t rcnt;
  uint8_t csect;


  *bf = 0;  /* Clear transfer byte counter */

  res = validate(fp);                               /* Check validity of the object */
  if (res != FR_OK) LEAVE_FF(fp->fs, res);
  if (fp->err)                                  /* Check error */
    LEAVE_FF(fp->fs, (FRESULT)fp->err);
  if (!(fp->flag & FA_READ))                        /* Check access mode */
    LEAVE_FF(fp->fs, FR_DENIED);

  remain = fp->fsize - fp->fptr;
  if (btf > remain) btf = (uint32_t)remain;         /* Truncate btf by remaining bytes */

  for ( ;  btf && (*func)(0, 0);                    /* Repeat until all data transferred or stream becomes busy */
        fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
    csect = (uint8_t)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
    if ((fp->fptr % SS(fp->fs)) == 0) {         /* On the sector boundary? */
      if (!csect) {                         /* On the cluster boundary? */
        clst = (fp->fptr == 0) ?            /* On the top of the file? */
          fp->sclust : get_fat(fp->fs, fp->clust);
        if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
        if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
        fp->clust = clst;                   /* Update current cluster */
      }
    }
    sect = clust2sect(fp->fs, fp->clust);       /* Get current data sector */
    if (!sect) ABORT(fp->fs, FR_INT_ERR);
    sect += csect;
    if (move_window(fp->fs, sect) != FR_OK)     /* Move sector window */
      ABORT(fp->fs, FR_DISK_ERR);
    fp->dsect = sect;
    rcnt = SS(fp->fs) - (uint16_t)(fp->fptr % SS(fp->fs));  /* Forward data from sector window */
    if (rcnt > btf) rcnt = btf;
    rcnt = (*func)(&fp->fs->win[(uint16_t)fp->fptr % SS(fp->fs)], rcnt);
    if (!rcnt) ABORT(fp->fs, FR_INT_ERR);
  }

  LEAVE_FF(fp->fs, FR_OK);
}
#endif /* _USE_FORWARD */



#if _USE_MKFS && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Create file system on the logical drive                               */
/*-----------------------------------------------------------------------*/
#define N_ROOTDIR   512     /* Number of root directory entries for FAT12/16 */
#define N_FATS      1       /* Number of FATs (1 or 2) */


FRESULT f_mkfs (
                const TCHAR* path,  /* Logical drive number */
                uint8_t sfd,           /* Partitioning rule 0:FDISK, 1:SFD */
                uint32_t au             /* Size of allocation unit in unit of byte or sector */
                )
{
  static const uint16_t vst[] = { 1024,   512,  256,  128,   64,    32,   16,    8,    4,    2,   0};
  static const uint16_t cst[] = {32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512};
  int vol;
  uint8_t fmt, md, sys, *tbl, pdrv, part;
  uint32_t n_clst, vs, n, wsect;
  uint32_t i;
  uint32_t b_vol, b_fat, b_dir, b_data;    /* LBA */
  uint32_t n_vol, n_rsv, n_fat, n_dir; /* Size */
  FATFS *fs;
  DSTATUS stat;
#if _USE_TRIM
  uint32_t eb[2];
#endif


  /* Check mounted drive and clear work area */
  if (sfd > 1) return FR_INVALID_PARAMETER;
  vol = get_ldnumber(&path);
  if (vol < 0) return FR_INVALID_DRIVE;
  fs = FatFs[vol];
  if (!fs) return FR_NOT_ENABLED;
  fs->fs_type = 0;
  pdrv = LD2PD(vol);    /* Physical drive */
  part = LD2PT(vol);    /* Partition (0:auto detect, 1-4:get from partition table)*/

  /* Get disk statics */
  stat = disk_initialize(pdrv);
  if (stat & STA_NOINIT) return FR_NOT_READY;
  if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
#if _MAX_SS != _MIN_SS      /* Get disk sector size */
  if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS || SS(fs) < _MIN_SS)
    return FR_DISK_ERR;
#endif
  if (_MULTI_PARTITION && part) {
    /* Get partition information from partition table in the MBR */
    if (disk_read(pdrv, fs->win, 0, 1) != RES_OK) return FR_DISK_ERR;
    if (LD_WORD(fs->win + BS_55AA) != 0xAA55) return FR_MKFS_ABORTED;
    tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
    if (!tbl[4]) return FR_MKFS_ABORTED;    /* No partition? */
    b_vol = LD_DWORD(tbl + 8);  /* Volume start sector */
    n_vol = LD_DWORD(tbl + 12); /* Volume size */
  } else {
    /* Create a partition in this function */
    if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
      return FR_DISK_ERR;
    b_vol = (sfd) ? 0 : 63;     /* Volume start sector */
    n_vol -= b_vol;             /* Volume size */
  }

  if (au & (au - 1)) au = 0;
  if (!au) {                        /* AU auto selection */
    vs = n_vol / (2000 / (SS(fs) / 512));
    for (i = 0; vs < vst[i]; i++) ;
    au = cst[i];
  }
  if (au >= _MIN_SS) au /= SS(fs);  /* Number of sectors per cluster */
  if (!au) au = 1;
  if (au > 128) au = 128;

  /* Pre-compute number of clusters and FAT sub-type */
  n_clst = n_vol / au;
  fmt = FS_FAT12;
  if (n_clst >= MIN_FAT16) fmt = FS_FAT16;
  if (n_clst >= MIN_FAT32) fmt = FS_FAT32;

  /* Determine offset and size of FAT structure */
  if (fmt == FS_FAT32) {
    n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
    n_rsv = 32;
    n_dir = 0;
  } else {
    n_fat = (fmt == FS_FAT12) ? (n_clst * 3 + 1) / 2 + 3 : (n_clst * 2) + 4;
    n_fat = (n_fat + SS(fs) - 1) / SS(fs);
    n_rsv = 1;
    n_dir = (uint32_t)N_ROOTDIR * SZ_DIRE / SS(fs);
  }
  b_fat = b_vol + n_rsv;                /* FAT area start sector */
  b_dir = b_fat + n_fat * N_FATS;       /* Directory area start sector */
  b_data = b_dir + n_dir;               /* Data area start sector */
  if (n_vol < b_data + au - b_vol) return FR_MKFS_ABORTED;  /* Too small volume */

  /* Align data start sector to erase block boundary (for flash memory media) */
  if (disk_ioctl(pdrv, GET_BLOCK_SIZE, &n) != RES_OK || !n || n > 32768) n = 1;
  n = (b_data + n - 1) & ~(n - 1);  /* Next nearest erase block from current data start */
  n = (n - b_data) / N_FATS;
  if (fmt == FS_FAT32) {        /* FAT32: Move FAT offset */
    n_rsv += n;
    b_fat += n;
  } else {                  /* FAT12/16: Expand FAT size */
    n_fat += n;
  }

  /* Determine number of clusters and final check of validity of the FAT sub-type */
  n_clst = (n_vol - n_rsv - n_fat * N_FATS - n_dir) / au;
  if (   (fmt == FS_FAT16 && n_clst < MIN_FAT16)
         || (fmt == FS_FAT32 && n_clst < MIN_FAT32))
    return FR_MKFS_ABORTED;

  /* Determine system ID in the partition table */
  if (fmt == FS_FAT32) {
    sys = 0x0C;     /* FAT32X */
  } else {
    if (fmt == FS_FAT12 && n_vol < 0x10000) {
      sys = 0x01;   /* FAT12(<65536) */
    } else {
      sys = (n_vol < 0x10000) ? 0x04 : 0x06;    /* FAT16(<65536) : FAT12/16(>=65536) */
    }
  }

  if (_MULTI_PARTITION && part) {
    /* Update system ID in the partition table */
    tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
    tbl[4] = sys;
    if (disk_write(pdrv, fs->win, 0, 1) != RES_OK)  /* Write it to teh MBR */
      return FR_DISK_ERR;
    md = 0xF8;
  } else {
    if (sfd) {  /* No partition table (SFD) */
      md = 0xF0;
    } else {    /* Create partition table (FDISK) */
      mem_set(fs->win, 0, SS(fs));
      tbl = fs->win + MBR_Table;    /* Create partition table for single partition in the drive */
      tbl[1] = 1;                       /* Partition start head */
      tbl[2] = 1;                       /* Partition start sector */
      tbl[3] = 0;                       /* Partition start cylinder */
      tbl[4] = sys;                 /* System type */
      tbl[5] = 254;                 /* Partition end head */
      n = (b_vol + n_vol) / 63 / 255;
      tbl[6] = (uint8_t)(n >> 2 | 63); /* Partition end sector */
      tbl[7] = (uint8_t)n;             /* End cylinder */
      ST_DWORD(tbl + 8, 63);            /* Partition start in LBA */
      ST_DWORD(tbl + 12, n_vol);        /* Partition size in LBA */
      ST_WORD(fs->win + BS_55AA, 0xAA55);   /* MBR signature */
      if (disk_write(pdrv, fs->win, 0, 1) != RES_OK)    /* Write it to the MBR */
        return FR_DISK_ERR;
      md = 0xF8;
    }
  }

  /* Create BPB in the VBR */
  tbl = fs->win;                            /* Clear sector */
  mem_set(tbl, 0, SS(fs));
  mem_cpy(tbl, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code, OEM name */
  i = SS(fs);                               /* Sector size */
  ST_WORD(tbl + BPB_BytsPerSec, i);
  tbl[BPB_SecPerClus] = (uint8_t)au;           /* Sectors per cluster */
  ST_WORD(tbl + BPB_RsvdSecCnt, n_rsv); /* Reserved sectors */
  tbl[BPB_NumFATs] = N_FATS;                /* Number of FATs */
  i = (fmt == FS_FAT32) ? 0 : N_ROOTDIR;    /* Number of root directory entries */
  ST_WORD(tbl + BPB_RootEntCnt, i);
  if (n_vol < 0x10000) {                    /* Number of total sectors */
    ST_WORD(tbl + BPB_TotSec16, n_vol);
  } else {
    ST_DWORD(tbl + BPB_TotSec32, n_vol);
  }
  tbl[BPB_Media] = md;                  /* Media descriptor */
  ST_WORD(tbl + BPB_SecPerTrk, 63);     /* Number of sectors per track */
  ST_WORD(tbl + BPB_NumHeads, 255);     /* Number of heads */
  ST_DWORD(tbl + BPB_HiddSec, b_vol);       /* Hidden sectors */
  n = GET_FATTIME();                        /* Use current time as VSN */
  if (fmt == FS_FAT32) {
    ST_DWORD(tbl + BS_VolID32, n);      /* VSN */
    ST_DWORD(tbl + BPB_FATSz32, n_fat); /* Number of sectors per FAT */
    ST_DWORD(tbl + BPB_RootClus, 2);    /* Root directory start cluster (2) */
    ST_WORD(tbl + BPB_FSInfo, 1);       /* FSINFO record offset (VBR + 1) */
    ST_WORD(tbl + BPB_BkBootSec, 6);    /* Backup boot record offset (VBR + 6) */
    tbl[BS_DrvNum32] = 0x80;            /* Drive number */
    tbl[BS_BootSig32] = 0x29;           /* Extended boot signature */
    mem_cpy(tbl + BS_VolLab32, "NO NAME    " "FAT32   ", 19);   /* Volume label, FAT signature */
  } else {
    ST_DWORD(tbl + BS_VolID, n);        /* VSN */
    ST_WORD(tbl + BPB_FATSz16, n_fat);  /* Number of sectors per FAT */
    tbl[BS_DrvNum] = 0x80;              /* Drive number */
    tbl[BS_BootSig] = 0x29;             /* Extended boot signature */
    mem_cpy(tbl + BS_VolLab, "NO NAME    " "FAT     ", 19); /* Volume label, FAT signature */
  }
  ST_WORD(tbl + BS_55AA, 0xAA55);           /* Signature (Offset is fixed here regardless of sector size) */
  if (disk_write(pdrv, tbl, b_vol, 1) != RES_OK)    /* Write it to the VBR sector */
    return FR_DISK_ERR;
  if (fmt == FS_FAT32)                  /* Write it to the backup VBR if needed (VBR + 6) */
    disk_write(pdrv, tbl, b_vol + 6, 1);

  /* Initialize FAT area */
  wsect = b_fat;
  for (i = 0; i < N_FATS; i++) {        /* Initialize each FAT copy */
    mem_set(tbl, 0, SS(fs));            /* 1st sector of the FAT  */
    n = md;                             /* Media descriptor byte */
    if (fmt != FS_FAT32) {
      n |= (fmt == FS_FAT12) ? 0x00FFFF00 : 0xFFFFFF00;
      ST_DWORD(tbl + 0, n);         /* Reserve cluster #0-1 (FAT12/16) */
    } else {
      n |= 0xFFFFFF00;
      ST_DWORD(tbl + 0, n);         /* Reserve cluster #0-1 (FAT32) */
      ST_DWORD(tbl + 4, 0xFFFFFFFF);
      ST_DWORD(tbl + 8, 0x0FFFFFFF);    /* Reserve cluster #2 for root directory */
    }
    if (disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
      return FR_DISK_ERR;
    mem_set(tbl, 0, SS(fs));            /* Fill following FAT entries with zero */
    for (n = 1; n < n_fat; n++) {       /* This loop may take a time on FAT32 volume due to many single sector writes */
      if (disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
        return FR_DISK_ERR;
    }
  }

  /* Initialize root directory */
  i = (fmt == FS_FAT32) ? au : (uint32_t)n_dir;
  do {
    if (disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
      return FR_DISK_ERR;
  } while (--i);

#if _USE_TRIM   /* Erase data area if needed */
  {
    eb[0] = wsect; eb[1] = wsect + (n_clst - ((fmt == FS_FAT32) ? 1 : 0)) * au - 1;
    disk_ioctl(pdrv, CTRL_TRIM, eb);
  }
#endif

  /* Create FSINFO if needed */
  if (fmt == FS_FAT32) {
    ST_DWORD(tbl + FSI_LeadSig, 0x41615252);
    ST_DWORD(tbl + FSI_StrucSig, 0x61417272);
    ST_DWORD(tbl + FSI_Free_Count, n_clst - 1); /* Number of free clusters */
    ST_DWORD(tbl + FSI_Nxt_Free, 2);            /* Last allocated cluster# */
    ST_WORD(tbl + BS_55AA, 0xAA55);
    disk_write(pdrv, tbl, b_vol + 1, 1);    /* Write original (VBR + 1) */
    disk_write(pdrv, tbl, b_vol + 7, 1);    /* Write backup (VBR + 7) */
  }

  return (disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
}



#if _MULTI_PARTITION
/*-----------------------------------------------------------------------*/
/* Create partition table on the physical drive                          */
/*-----------------------------------------------------------------------*/

FRESULT f_fdisk (
                 uint8_t pdrv,         /* Physical drive number */
                 const uint32_t szt[], /* Pointer to the size table for each partitions */
                 void* work         /* Pointer to the working buffer */
                 )
{
  uint32_t i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
  uint8_t s_hd, e_hd, *p, *buf = (uint8_t*)work;
  DSTATUS stat;
  uint32_t sz_disk, sz_part, s_part;


  stat = disk_initialize(pdrv);
  if (stat & STA_NOINIT) return FR_NOT_READY;
  if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
  if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;

  /* Determine CHS in the table regardless of the drive geometry */
  for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
  if (n == 256) n--;
  e_hd = n - 1;
  sz_cyl = 63 * n;
  tot_cyl = sz_disk / sz_cyl;

  /* Create partition table */
  mem_set(buf, 0, _MAX_SS);
  p = buf + MBR_Table; b_cyl = 0;
  for (i = 0; i < 4; i++, p += SZ_PTE) {
    p_cyl = (szt[i] <= 100U) ? (uint32_t)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl;
    if (!p_cyl) continue;
    s_part = (uint32_t)sz_cyl * b_cyl;
    sz_part = (uint32_t)sz_cyl * p_cyl;
    if (i == 0) {   /* Exclude first track of cylinder 0 */
      s_hd = 1;
      s_part += 63; sz_part -= 63;
    } else {
      s_hd = 0;
    }
    e_cyl = b_cyl + p_cyl - 1;
    if (e_cyl >= tot_cyl) return FR_INVALID_PARAMETER;

    /* Set partition table */
    p[1] = s_hd;                        /* Start head */
    p[2] = (uint8_t)((b_cyl >> 2) + 1);    /* Start sector */
    p[3] = (uint8_t)b_cyl;                 /* Start cylinder */
    p[4] = 0x06;                        /* System type (temporary setting) */
    p[5] = e_hd;                        /* End head */
    p[6] = (uint8_t)((e_cyl >> 2) + 63);   /* End sector */
    p[7] = (uint8_t)e_cyl;                 /* End cylinder */
    ST_DWORD(p + 8, s_part);            /* Start sector in LBA */
    ST_DWORD(p + 12, sz_part);          /* Partition size */

    /* Next partition */
    b_cyl += p_cyl;
  }
  ST_WORD(p, 0xAA55);

  /* Write it to the MBR */
  return (disk_write(pdrv, buf, 0, 1) != RES_OK || disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) ? FR_DISK_ERR : FR_OK;
}


#endif /* _MULTI_PARTITION */
#endif /* _USE_MKFS && !_FS_READONLY */




#if _USE_STRFUNC
/*-----------------------------------------------------------------------*/
/* Get a string from the file                                            */
/*-----------------------------------------------------------------------*/

TCHAR* f_gets (
               TCHAR* buff, /* Pointer to the string buffer to read */
               int len,     /* Size of string buffer (characters) */
               FIL* fp          /* Pointer to the file object */
               )
{
  int n = 0;
  TCHAR c, *p = buff;
  uint8_t s[2];
  uint32_t rc;


  while (n < len - 1) { /* Read characters until buffer gets filled */
#if _USE_LFN && _LFN_UNICODE
#if _STRF_ENCODE == 3       /* Read a character in UTF-8 */
    f_read(fp, s, 1, &rc);
    if (rc != 1) break;
    c = s[0];
    if (c >= 0x80) {
      if (c < 0xC0) continue;   /* Skip stray trailer */
      if (c < 0xE0) {           /* Two-byte sequence */
        f_read(fp, s, 1, &rc);
        if (rc != 1) break;
        c = (c & 0x1F) << 6 | (s[0] & 0x3F);
        if (c < 0x80) c = '?';
      } else {
        if (c < 0xF0) {     /* Three-byte sequence */
          f_read(fp, s, 2, &rc);
          if (rc != 2) break;
          c = c << 12 | (s[0] & 0x3F) << 6 | (s[1] & 0x3F);
          if (c < 0x800) c = '?';
        } else {            /* Reject four-byte sequence */
          c = '?';
        }
      }
    }
#elif _STRF_ENCODE == 2     /* Read a character in UTF-16BE */
    f_read(fp, s, 2, &rc);
    if (rc != 2) break;
    c = s[1] + (s[0] << 8);
#elif _STRF_ENCODE == 1     /* Read a character in UTF-16LE */
    f_read(fp, s, 2, &rc);
    if (rc != 2) break;
    c = s[0] + (s[1] << 8);
#else                       /* Read a character in ANSI/OEM */
    f_read(fp, s, 1, &rc);
    if (rc != 1) break;
    c = s[0];
    if (IsDBCS1(c)) {
      f_read(fp, s, 1, &rc);
      if (rc != 1) break;
      c = (c << 8) + s[0];
    }
    c = ff_convert(c, 1);   /* OEM -> Unicode */
    if (!c) c = '?';
#endif
#else                       /* Read a character without conversion */
    f_read(fp, s, 1, &rc);
    if (rc != 1) break;
    c = s[0];
#endif
    if (_USE_STRFUNC == 2 && c == '\r') continue;   /* Strip '\r' */
    *p++ = c;
    n++;
    if (c == '\n') break;       /* Break on EOL */
  }
  *p = 0;
  return n ? buff : 0;          /* When no data read (eof or error), return with error. */
}




#if !_FS_READONLY
#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a character to the file                                           */
/*-----------------------------------------------------------------------*/

typedef struct {
  FIL* fp;
  int idx, nchr;
  uint8_t buf[64];
} putbuff;


static
void putc_bfd (
               putbuff* pb,
               TCHAR c
               )
{
  uint32_t bw;
  int i;


  if (_USE_STRFUNC == 2 && c == '\n')    /* LF -> CRLF conversion */
    putc_bfd(pb, '\r');

  i = pb->idx;  /* Buffer write index (-1:error) */
  if (i < 0) return;

#if _USE_LFN && _LFN_UNICODE
#if _STRF_ENCODE == 3           /* Write a character in UTF-8 */
  if (c < 0x80) {               /* 7-bit */
    pb->buf[i++] = (uint8_t)c;
  } else {
    if (c < 0x800) {        /* 11-bit */
      pb->buf[i++] = (uint8_t)(0xC0 | c >> 6);
    } else {                /* 16-bit */
      pb->buf[i++] = (uint8_t)(0xE0 | c >> 12);
      pb->buf[i++] = (uint8_t)(0x80 | (c >> 6 & 0x3F));
    }
    pb->buf[i++] = (uint8_t)(0x80 | (c & 0x3F));
  }
#elif _STRF_ENCODE == 2         /* Write a character in UTF-16BE */
  pb->buf[i++] = (uint8_t)(c >> 8);
  pb->buf[i++] = (uint8_t)c;
#elif _STRF_ENCODE == 1         /* Write a character in UTF-16LE */
  pb->buf[i++] = (uint8_t)c;
  pb->buf[i++] = (uint8_t)(c >> 8);
#else                           /* Write a character in ANSI/OEM */
  c = ff_convert(c, 0); /* Unicode -> OEM */
  if (!c) c = '?';
  if (c >= 0x100)
    pb->buf[i++] = (uint8_t)(c >> 8);
  pb->buf[i++] = (uint8_t)c;
#endif
#else                           /* Write a character without conversion */
  pb->buf[i++] = (uint8_t)c;
#endif

  if (i >= (int)(sizeof pb->buf) - 3) { /* Write buffered characters to the file */
    f_write(pb->fp, pb->buf, (uint32_t)i, &bw);
    i = (bw == (uint32_t)i) ? 0 : -1;
  }
  pb->idx = i;
  pb->nchr++;
}



int f_putc (
            TCHAR c,    /* A character to be output */
            FIL* fp     /* Pointer to the file object */
            )
{
  putbuff pb;
  uint32_t nw;


  pb.fp = fp;           /* Initialize output buffer */
  pb.nchr = pb.idx = 0;

  putc_bfd(&pb, c); /* Put a character */

  if (   pb.idx >= 0    /* Flush buffered characters to the file */
         && f_write(pb.fp, pb.buf, (uint32_t)pb.idx, &nw) == FR_OK
         && (uint32_t)pb.idx == nw) return pb.nchr;
  return EOF;
}




/*-----------------------------------------------------------------------*/
/* Put a string to the file                                              */
/*-----------------------------------------------------------------------*/

int f_puts (
            const TCHAR* str,   /* Pointer to the string to be output */
            FIL* fp             /* Pointer to the file object */
            )
{
  putbuff pb;
  uint32_t nw;


  pb.fp = fp;               /* Initialize output buffer */
  pb.nchr = pb.idx = 0;

  while (*str)          /* Put the string */
    putc_bfd(&pb, *str++);

  if (   pb.idx >= 0        /* Flush buffered characters to the file */
         && f_write(pb.fp, pb.buf, (uint32_t)pb.idx, &nw) == FR_OK
         && (uint32_t)pb.idx == nw) return pb.nchr;
  return EOF;
}




/*-----------------------------------------------------------------------*/
/* Put a formatted string to the file                                    */
/*-----------------------------------------------------------------------*/

int f_printf (
              FIL* fp,          /* Pointer to the file object */
              const TCHAR* fmt, /* Pointer to the format string */
              ...                   /* Optional arguments... */
              )
{
  va_list arp;
  uint8_t f, r;
  uint32_t nw, i, j, w;
  uint32_t v;
  TCHAR c, d, s[16], *p;
  putbuff pb;


  pb.fp = fp;               /* Initialize output buffer */
  pb.nchr = pb.idx = 0;

  va_start(arp, fmt);

  for (;;) {
    c = *fmt++;
    if (c == 0) break;          /* End of string */
    if (c != '%') {             /* Non escape character */
      putc_bfd(&pb, c);
      continue;
    }
    w = f = 0;
    c = *fmt++;
    if (c == '0') {             /* Flag: '0' padding */
      f = 1; c = *fmt++;
    } else {
      if (c == '-') {           /* Flag: left justified */
        f = 2; c = *fmt++;
      }
    }
    while (IsDigit(c)) {        /* Precision */
      w = w * 10 + c - '0';
      c = *fmt++;
    }
    if (c == 'l' || c == 'L') { /* Prefix: Size is long int */
      f |= 4; c = *fmt++;
    }
    if (!c) break;
    d = c;
    if (IsLower(d)) d -= 0x20;
    switch (d) {                /* Type is... */
    case 'S' :                  /* String */
      p = va_arg(arp, TCHAR*);
      for (j = 0; p[j]; j++) ;
      if (!(f & 2)) {
        while (j++ < w) putc_bfd(&pb, ' ');
      }
      while (*p) putc_bfd(&pb, *p++);
      while (j++ < w) putc_bfd(&pb, ' ');
      continue;
    case 'C' :                  /* Character */
      putc_bfd(&pb, (TCHAR)va_arg(arp, int)); continue;
    case 'B' :                  /* Binary */
      r = 2; break;
    case 'O' :                  /* Octal */
      r = 8; break;
    case 'D' :                  /* Signed decimal */
    case 'U' :                  /* Unsigned decimal */
      r = 10; break;
    case 'X' :                  /* Hexdecimal */
      r = 16; break;
    default:                    /* Unknown type (pass-through) */
      putc_bfd(&pb, c); continue;
    }

    /* Get an argument and put it in numeral */
    v = (f & 4) ? (uint32_t)va_arg(arp, long) : ((d == 'D') ? (uint32_t)(long)va_arg(arp, int) : (uint32_t)va_arg(arp, unsigned int));
    if (d == 'D' && (v & 0x80000000)) {
      v = 0 - v;
      f |= 8;
    }
    i = 0;
    do {
      d = (TCHAR)(v % r); v /= r;
      if (d > 9) d += (c == 'x') ? 0x27 : 0x07;
      s[i++] = d + '0';
    } while (v && i < sizeof s / sizeof s[0]);
    if (f & 8) s[i++] = '-';
    j = i; d = (f & 1) ? '0' : ' ';
    while (!(f & 2) && j++ < w) putc_bfd(&pb, d);
    do putc_bfd(&pb, s[--i]); while (i);
    while (j++ < w) putc_bfd(&pb, d);
  }

  va_end(arp);

  if (   pb.idx >= 0        /* Flush buffered characters to the file */
         && f_write(pb.fp, pb.buf, (uint32_t)pb.idx, &nw) == FR_OK
         && (uint32_t)pb.idx == nw) return pb.nchr;
  return EOF;
}

#endif /* !_FS_READONLY */
#endif /* _USE_STRFUNC */
